1/* 2 * Licensed to the Apache Software Foundation (ASF) under one or more 3 * contributor license agreements. See the NOTICE file distributed with 4 * this work for additional information regarding copyright ownership. 5 * The ASF licenses this file to You under the Apache License, Version 2.0 6 * (the "License"); you may not use this file except in compliance with 7 * the License. You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 18package org.apache.harmony.tests.java.lang; 19 20public class MathTest extends junit.framework.TestCase { 21 22 double HYP = Math.sqrt(2.0); 23 24 double OPP = 1.0; 25 26 double ADJ = 1.0; 27 28 /* Required to make previous preprocessor flags work - do not remove */ 29 int unused = 0; 30 31 /** 32 * java.lang.Math#abs(double) 33 */ 34 public void test_absD() { 35 // Test for method double java.lang.Math.abs(double) 36 37 assertTrue("Incorrect double abs value", 38 (Math.abs(-1908.8976) == 1908.8976)); 39 assertTrue("Incorrect double abs value", 40 (Math.abs(1908.8976) == 1908.8976)); 41 } 42 43 /** 44 * java.lang.Math#abs(float) 45 */ 46 public void test_absF() { 47 // Test for method float java.lang.Math.abs(float) 48 assertTrue("Incorrect float abs value", 49 (Math.abs(-1908.8976f) == 1908.8976f)); 50 assertTrue("Incorrect float abs value", 51 (Math.abs(1908.8976f) == 1908.8976f)); 52 } 53 54 /** 55 * java.lang.Math#abs(int) 56 */ 57 public void test_absI() { 58 // Test for method int java.lang.Math.abs(int) 59 assertTrue("Incorrect int abs value", (Math.abs(-1908897) == 1908897)); 60 assertTrue("Incorrect int abs value", (Math.abs(1908897) == 1908897)); 61 } 62 63 /** 64 * java.lang.Math#abs(long) 65 */ 66 public void test_absJ() { 67 // Test for method long java.lang.Math.abs(long) 68 assertTrue("Incorrect long abs value", 69 (Math.abs(-19088976000089L) == 19088976000089L)); 70 assertTrue("Incorrect long abs value", 71 (Math.abs(19088976000089L) == 19088976000089L)); 72 } 73 74 /** 75 * java.lang.Math#acos(double) 76 */ 77 public void test_acosD() { 78 // Test for method double java.lang.Math.acos(double) 79 double r = Math.cos(Math.acos(ADJ / HYP)); 80 long lr = Double.doubleToLongBits(r); 81 long t = Double.doubleToLongBits(ADJ / HYP); 82 assertTrue("Returned incorrect arc cosine", lr == t || (lr + 1) == t 83 || (lr - 1) == t); 84 } 85 86 /** 87 * java.lang.Math#asin(double) 88 */ 89 public void test_asinD() { 90 // Test for method double java.lang.Math.asin(double) 91 double r = Math.sin(Math.asin(OPP / HYP)); 92 long lr = Double.doubleToLongBits(r); 93 long t = Double.doubleToLongBits(OPP / HYP); 94 assertTrue("Returned incorrect arc sine", lr == t || (lr + 1) == t 95 || (lr - 1) == t); 96 } 97 98 /** 99 * java.lang.Math#atan(double) 100 */ 101 public void test_atanD() { 102 // Test for method double java.lang.Math.atan(double) 103 double answer = Math.tan(Math.atan(1.0)); 104 assertTrue("Returned incorrect arc tangent: " + answer, answer <= 1.0 105 && answer >= 9.9999999999999983E-1); 106 } 107 108 /** 109 * java.lang.Math#atan2(double, double) 110 */ 111 public void test_atan2DD() { 112 // Test for method double java.lang.Math.atan2(double, double) 113 double answer = Math.atan(Math.tan(1.0)); 114 assertTrue("Returned incorrect arc tangent: " + answer, answer <= 1.0 115 && answer >= 9.9999999999999983E-1); 116 } 117 118 /** 119 * java.lang.Math#cbrt(double) 120 */ 121 public void test_cbrt_D() { 122 //Test for special situations 123 assertTrue(Double.isNaN(Math.cbrt(Double.NaN))); 124 assertEquals(Double.POSITIVE_INFINITY, Math.cbrt(Double.POSITIVE_INFINITY), 0D); 125 assertEquals(Double.NEGATIVE_INFINITY, Math.cbrt(Double.NEGATIVE_INFINITY), 0D); 126 assertEquals(Double.doubleToLongBits(0.0), Double.doubleToLongBits(Math.cbrt(0.0))); 127 assertEquals(Double.doubleToLongBits(+0.0), Double.doubleToLongBits(Math.cbrt(+0.0))); 128 assertEquals(Double.doubleToLongBits(-0.0), Double.doubleToLongBits(Math.cbrt(-0.0))); 129 130 assertEquals(3.0, Math.cbrt(27.0), 0D); 131 assertEquals(23.111993172558684, Math.cbrt(12345.6), Math.ulp(23.111993172558684)); 132 assertEquals(5.643803094122362E102, Math.cbrt(Double.MAX_VALUE), 0D); 133 assertEquals(0.01, Math.cbrt(0.000001), 0D); 134 135 assertEquals(-3.0, Math.cbrt(-27.0), 0D); 136 assertEquals(-23.111993172558684, Math.cbrt(-12345.6), Math.ulp(-23.111993172558684)); 137 assertEquals(1.7031839360032603E-108, Math.cbrt(Double.MIN_VALUE), 0D); 138 assertEquals(-0.01, Math.cbrt(-0.000001), 0D); 139 } 140 141 /** 142 * java.lang.Math#ceil(double) 143 */ 144 public void test_ceilD() { 145 // Test for method double java.lang.Math.ceil(double) 146 assertEquals("Incorrect ceiling for double", 147 79, Math.ceil(78.89), 0); 148 assertEquals("Incorrect ceiling for double", 149 -78, Math.ceil(-78.89), 0); 150 } 151 152 /** 153 * cases for test_copySign_DD in MathTest/StrictMathTest 154 */ 155 static final double[] COPYSIGN_DD_CASES = new double[] { 156 Double.POSITIVE_INFINITY, Double.MAX_VALUE, 3.4E302, 2.3, 157 Double.MIN_NORMAL, Double.MIN_NORMAL / 2, Double.MIN_VALUE, +0.0, 158 0.0, -0.0, -Double.MIN_VALUE, -Double.MIN_NORMAL / 2, 159 -Double.MIN_NORMAL, -4.5, -3.4E102, -Double.MAX_VALUE, 160 Double.NEGATIVE_INFINITY }; 161 162 /** 163 * {@link java.lang.Math#copySign(double, double)} 164 * @since 1.6 165 */ 166 @SuppressWarnings("boxing") 167 public void test_copySign_DD() { 168 for (int i = 0; i < COPYSIGN_DD_CASES.length; i++) { 169 final double magnitude = COPYSIGN_DD_CASES[i]; 170 final long absMagnitudeBits = Double.doubleToLongBits(Math 171 .abs(magnitude)); 172 final long negMagnitudeBits = Double.doubleToLongBits(-Math 173 .abs(magnitude)); 174 175 // cases for NaN 176 assertEquals("If the sign is NaN, the result should be positive.", 177 absMagnitudeBits, Double.doubleToLongBits(Math.copySign( 178 magnitude, Double.NaN))); 179 assertTrue("The result should be NaN.", Double.isNaN(Math.copySign( 180 Double.NaN, magnitude))); 181 182 for (int j = 0; j < COPYSIGN_DD_CASES.length; j++) { 183 final double sign = COPYSIGN_DD_CASES[j]; 184 final long resultBits = Double.doubleToLongBits(Math.copySign( 185 magnitude, sign)); 186 187 if (sign > 0 || Double.valueOf(+0.0).equals(sign) 188 || Double.valueOf(0.0).equals(sign)) { 189 assertEquals( 190 "If the sign is positive, the result should be positive.", 191 absMagnitudeBits, resultBits); 192 } 193 if (sign < 0 || Double.valueOf(-0.0).equals(sign)) { 194 assertEquals( 195 "If the sign is negative, the result should be negative.", 196 negMagnitudeBits, resultBits); 197 } 198 } 199 } 200 201 assertTrue("The result should be NaN.", Double.isNaN(Math.copySign( 202 Double.NaN, Double.NaN))); 203 204 try { 205 Math.copySign((Double) null, 2.3); 206 fail("Should throw NullPointerException"); 207 } catch (NullPointerException e) { 208 // Expected 209 } 210 try { 211 Math.copySign(2.3, (Double) null); 212 fail("Should throw NullPointerException"); 213 } catch (NullPointerException e) { 214 // Expected 215 } 216 try { 217 Math.copySign((Double) null, (Double) null); 218 fail("Should throw NullPointerException"); 219 } catch (NullPointerException e) { 220 // Expected 221 } 222 } 223 224 /** 225 * cases for test_copySign_FF in MathTest/StrictMathTest 226 */ 227 static final float[] COPYSIGN_FF_CASES = new float[] { 228 Float.POSITIVE_INFINITY, Float.MAX_VALUE, 3.4E12f, 2.3f, 229 Float.MIN_NORMAL, Float.MIN_NORMAL / 2, Float.MIN_VALUE, +0.0f, 230 0.0f, -0.0f, -Float.MIN_VALUE, -Float.MIN_NORMAL / 2, 231 -Float.MIN_NORMAL, -4.5f, -5.6442E21f, -Float.MAX_VALUE, 232 Float.NEGATIVE_INFINITY }; 233 234 /** 235 * {@link java.lang.Math#copySign(float, float)} 236 * @since 1.6 237 */ 238 @SuppressWarnings("boxing") 239 public void test_copySign_FF() { 240 for (int i = 0; i < COPYSIGN_FF_CASES.length; i++) { 241 final float magnitude = COPYSIGN_FF_CASES[i]; 242 final int absMagnitudeBits = Float.floatToIntBits(Math 243 .abs(magnitude)); 244 final int negMagnitudeBits = Float.floatToIntBits(-Math 245 .abs(magnitude)); 246 247 // cases for NaN 248 assertEquals("If the sign is NaN, the result should be positive.", 249 absMagnitudeBits, Float.floatToIntBits(Math.copySign( 250 magnitude, Float.NaN))); 251 assertTrue("The result should be NaN.", Float.isNaN(Math.copySign( 252 Float.NaN, magnitude))); 253 254 for (int j = 0; j < COPYSIGN_FF_CASES.length; j++) { 255 final float sign = COPYSIGN_FF_CASES[j]; 256 final int resultBits = Float.floatToIntBits(Math.copySign( 257 magnitude, sign)); 258 if (sign > 0 || Float.valueOf(+0.0f).equals(sign) 259 || Float.valueOf(0.0f).equals(sign)) { 260 assertEquals( 261 "If the sign is positive, the result should be positive.", 262 absMagnitudeBits, resultBits); 263 } 264 if (sign < 0 || Float.valueOf(-0.0f).equals(sign)) { 265 assertEquals( 266 "If the sign is negative, the result should be negative.", 267 negMagnitudeBits, resultBits); 268 } 269 } 270 } 271 272 assertTrue("The result should be NaN.", Float.isNaN(Math.copySign( 273 Float.NaN, Float.NaN))); 274 275 try { 276 Math.copySign((Float) null, 2.3f); 277 fail("Should throw NullPointerException"); 278 } catch (NullPointerException e) { 279 // Expected 280 } 281 try { 282 Math.copySign(2.3f, (Float) null); 283 fail("Should throw NullPointerException"); 284 } catch (NullPointerException e) { 285 // Expected 286 } 287 try { 288 Math.copySign((Float) null, (Float) null); 289 fail("Should throw NullPointerException"); 290 } catch (NullPointerException e) { 291 // Expected 292 } 293 } 294 295 /** 296 * java.lang.Math#cos(double) 297 */ 298 public void test_cosD() { 299 // Test for method double java.lang.Math.cos(double) 300 assertEquals("Incorrect answer", 1.0, Math.cos(0), 0D); 301 assertEquals("Incorrect answer", 0.5403023058681398, Math.cos(1), 0D); 302 } 303 304 /** 305 * java.lang.Math#cosh(double) 306 */ 307 public void test_cosh_D() { 308 // Test for special situations 309 assertTrue(Double.isNaN(Math.cosh(Double.NaN))); 310 assertEquals("Should return POSITIVE_INFINITY", 311 Double.POSITIVE_INFINITY, Math.cosh(Double.POSITIVE_INFINITY), 0D); 312 assertEquals("Should return POSITIVE_INFINITY", 313 Double.POSITIVE_INFINITY, Math.cosh(Double.NEGATIVE_INFINITY), 0D); 314 assertEquals("Should return 1.0", 1.0, Math.cosh(+0.0), 0D); 315 assertEquals("Should return 1.0", 1.0, Math.cosh(-0.0), 0D); 316 317 assertEquals("Should return POSITIVE_INFINITY", 318 Double.POSITIVE_INFINITY, Math.cosh(1234.56), 0D); 319 assertEquals("Should return POSITIVE_INFINITY", 320 Double.POSITIVE_INFINITY, Math.cosh(-1234.56), 0D); 321 assertEquals("Should return 1.0000000000005", 1.0000000000005, Math 322 .cosh(0.000001), 0D); 323 assertEquals("Should return 1.0000000000005", 1.0000000000005, Math 324 .cosh(-0.000001), 0D); 325 assertEquals("Should return 5.212214351945598", 5.212214351945598, Math 326 .cosh(2.33482), 0D); 327 328 assertEquals("Should return POSITIVE_INFINITY", 329 Double.POSITIVE_INFINITY, Math.cosh(Double.MAX_VALUE), 0D); 330 assertEquals("Should return 1.0", 1.0, Math.cosh(Double.MIN_VALUE), 0D); 331 } 332 333 /** 334 * java.lang.Math#exp(double) 335 */ 336 public void test_expD() { 337 // Test for method double java.lang.Math.exp(double) 338 assertTrue("Incorrect answer returned for simple power", Math.abs(Math 339 .exp(4D) 340 - Math.E * Math.E * Math.E * Math.E) < 0.1D); 341 assertTrue("Incorrect answer returned for larger power", Math.log(Math 342 .abs(Math.exp(5.5D)) - 5.5D) < 10.0D); 343 } 344 345 /** 346 * java.lang.Math#expm1(double) 347 */ 348 public void test_expm1_D() { 349 // Test for special cases 350 assertTrue("Should return NaN", Double.isNaN(Math.expm1(Double.NaN))); 351 assertEquals("Should return POSITIVE_INFINITY", 352 Double.POSITIVE_INFINITY, Math.expm1(Double.POSITIVE_INFINITY), 0D); 353 assertEquals("Should return -1.0", -1.0, Math 354 .expm1(Double.NEGATIVE_INFINITY), 0D); 355 assertEquals(Double.doubleToLongBits(0.0), Double.doubleToLongBits(Math 356 .expm1(0.0))); 357 assertEquals(Double.doubleToLongBits(+0.0), Double 358 .doubleToLongBits(Math.expm1(+0.0))); 359 assertEquals(Double.doubleToLongBits(-0.0), Double 360 .doubleToLongBits(Math.expm1(-0.0))); 361 362 assertEquals("Should return -9.999950000166666E-6", 363 -9.999950000166666E-6, Math.expm1(-0.00001), 0D); 364 assertEquals("Should return 1.0145103074469635E60", 365 1.0145103074469635E60, Math.expm1(138.16951162), 0D); 366 assertEquals("Should return POSITIVE_INFINITY", 367 Double.POSITIVE_INFINITY, Math 368 .expm1(123456789123456789123456789.4521584223), 0D); 369 assertEquals("Should return POSITIVE_INFINITY", 370 Double.POSITIVE_INFINITY, Math.expm1(Double.MAX_VALUE), 0D); 371 assertEquals("Should return MIN_VALUE", Double.MIN_VALUE, Math 372 .expm1(Double.MIN_VALUE), 0D); 373 } 374 375 /** 376 * java.lang.Math#floor(double) 377 */ 378 public void test_floorD() { 379 assertEquals("Incorrect floor for int", 42, Math.floor(42), 0); 380 assertEquals("Incorrect floor for -int", -2, Math.floor(-2), 0); 381 assertEquals("Incorrect floor for zero", 0d, Math.floor(0d), 0); 382 383 assertEquals("Incorrect floor for +double", 78, Math.floor(78.89), 0); 384 assertEquals("Incorrect floor for -double", -79, Math.floor(-78.89), 0); 385 assertEquals("floor large +double", 3.7314645675925406E19, Math.floor(3.7314645675925406E19), 0); 386 assertEquals("floor large -double", -8.173521839218E12, Math.floor(-8.173521839218E12), 0); 387 assertEquals("floor small double", 0.0d, Math.floor(1.11895241315E-102), 0); 388 389 // Compare toString representations here since -0.0 = +0.0, and 390 // NaN != NaN and we need to distinguish 391 assertEquals("Floor failed for NaN", 392 Double.toString(Double.NaN), Double.toString(Math.floor(Double.NaN))); 393 assertEquals("Floor failed for +0.0", 394 Double.toString(+0.0d), Double.toString(Math.floor(+0.0d))); 395 assertEquals("Floor failed for -0.0", 396 Double.toString(-0.0d), Double.toString(Math.floor(-0.0d))); 397 assertEquals("Floor failed for +infinity", 398 Double.toString(Double.POSITIVE_INFINITY), Double.toString(Math.floor(Double.POSITIVE_INFINITY))); 399 assertEquals("Floor failed for -infinity", 400 Double.toString(Double.NEGATIVE_INFINITY), Double.toString(Math.floor(Double.NEGATIVE_INFINITY))); 401 } 402 403 /** 404 * cases for test_getExponent_D in MathTest/StrictMathTest 405 */ 406 static final double GETEXPONENT_D_CASES[] = new double[] { 407 Double.POSITIVE_INFINITY, Double.NEGATIVE_INFINITY, 408 Double.MAX_VALUE, -Double.MAX_VALUE, 2.342E231, -2.342E231, 2800.0, 409 -2800.0, 5.323, -5.323, 1.323, -1.323, 0.623, -0.623, 0.323, 410 -0.323, Double.MIN_NORMAL * 24, -Double.MIN_NORMAL * 24, 411 Double.MIN_NORMAL, -Double.MIN_NORMAL, Double.MIN_NORMAL / 2, 412 -Double.MIN_NORMAL / 2, Double.MIN_VALUE, -Double.MIN_VALUE, +0.0, 413 0.0, -0.0, Double.NaN }; 414 415 /** 416 * result for test_getExponent_D in MathTest/StrictMathTest 417 */ 418 static final int GETEXPONENT_D_RESULTS[] = new int[] { 419 Double.MAX_EXPONENT + 1, Double.MAX_EXPONENT + 1, 420 Double.MAX_EXPONENT, Double.MAX_EXPONENT, 768, 768, 11, 11, 2, 2, 421 0, 0, -1, -1, -2, -2, -1018, -1018, Double.MIN_EXPONENT, 422 Double.MIN_EXPONENT, Double.MIN_EXPONENT - 1, 423 Double.MIN_EXPONENT - 1, Double.MIN_EXPONENT - 1, 424 Double.MIN_EXPONENT - 1, Double.MIN_EXPONENT - 1, 425 Double.MIN_EXPONENT - 1, Double.MIN_EXPONENT - 1, 426 Double.MAX_EXPONENT + 1 }; 427 428 /** 429 * {@link java.lang.Math#getExponent(double)} 430 * @since 1.6 431 */ 432 @SuppressWarnings("boxing") 433 public void test_getExponent_D() { 434 for (int i = 0; i < GETEXPONENT_D_CASES.length; i++) { 435 final double number = GETEXPONENT_D_CASES[i]; 436 final int result = GETEXPONENT_D_RESULTS[i]; 437 assertEquals("Wrong result of getExponent(double).", result, Math 438 .getExponent(number)); 439 } 440 441 try { 442 Math.getExponent((Double) null); 443 fail("Should throw NullPointerException"); 444 } catch (NullPointerException e) { 445 // Expected 446 } 447 } 448 449 /** 450 * cases for test_getExponent_F in MathTest/StrictMathTest 451 */ 452 static final float GETEXPONENT_F_CASES[] = new float[] { 453 Float.POSITIVE_INFINITY, Float.NEGATIVE_INFINITY, Float.MAX_VALUE, 454 -Float.MAX_VALUE, 3.4256E23f, -3.4256E23f, 2800.0f, -2800.0f, 455 5.323f, -5.323f, 1.323f, -1.323f, 0.623f, -0.623f, 0.323f, -0.323f, 456 Float.MIN_NORMAL * 24, -Float.MIN_NORMAL * 24, Float.MIN_NORMAL, 457 -Float.MIN_NORMAL, Float.MIN_NORMAL / 2, -Float.MIN_NORMAL / 2, 458 Float.MIN_VALUE, -Float.MIN_VALUE, +0.0f, 0.0f, -0.0f, Float.NaN, 1, Float.MIN_NORMAL * 1.5f }; 459 460 /** 461 * result for test_getExponent_F in MathTest/StrictMathTest 462 */ 463 static final int GETEXPONENT_F_RESULTS[] = new int[] { 464 Float.MAX_EXPONENT + 1, Float.MAX_EXPONENT + 1, Float.MAX_EXPONENT, 465 Float.MAX_EXPONENT, 78, 78, 11, 11, 2, 2, 0, 0, -1, -1, -2, -2, 466 -122, -122, Float.MIN_EXPONENT, Float.MIN_EXPONENT, 467 Float.MIN_EXPONENT - 1, Float.MIN_EXPONENT - 1, 468 Float.MIN_EXPONENT - 1, Float.MIN_EXPONENT - 1, 469 Float.MIN_EXPONENT - 1, Float.MIN_EXPONENT - 1, 470 Float.MIN_EXPONENT - 1, Float.MAX_EXPONENT + 1, 0, Float.MIN_EXPONENT }; 471 472 /** 473 * {@link java.lang.Math#getExponent(float)} 474 * @since 1.6 475 */ 476 @SuppressWarnings("boxing") 477 public void test_getExponent_F() { 478 for (int i = 0; i < GETEXPONENT_F_CASES.length; i++) { 479 final float number = GETEXPONENT_F_CASES[i]; 480 final int result = GETEXPONENT_F_RESULTS[i]; 481 assertEquals("Wrong result of getExponent(float).", result, Math 482 .getExponent(number)); 483 } 484 try { 485 Math.getExponent((Float) null); 486 fail("Should throw NullPointerException"); 487 } catch (NullPointerException e) { 488 // Expected 489 } 490 } 491 492 /** 493 * java.lang.Math#hypot(double, double) 494 */ 495 public void test_hypot_DD() { 496 // Test for special cases 497 assertEquals("Should return POSITIVE_INFINITY", 498 Double.POSITIVE_INFINITY, Math.hypot(Double.POSITIVE_INFINITY, 499 1.0), 0D); 500 assertEquals("Should return POSITIVE_INFINITY", 501 Double.POSITIVE_INFINITY, Math.hypot(Double.NEGATIVE_INFINITY, 502 123.324), 0D); 503 assertEquals("Should return POSITIVE_INFINITY", 504 Double.POSITIVE_INFINITY, Math.hypot(-758.2587, 505 Double.POSITIVE_INFINITY), 0D); 506 assertEquals("Should return POSITIVE_INFINITY", 507 Double.POSITIVE_INFINITY, Math.hypot(5687.21, 508 Double.NEGATIVE_INFINITY), 0D); 509 assertEquals("Should return POSITIVE_INFINITY", 510 Double.POSITIVE_INFINITY, Math.hypot(Double.POSITIVE_INFINITY, 511 Double.NEGATIVE_INFINITY), 0D); 512 assertEquals("Should return POSITIVE_INFINITY", 513 Double.POSITIVE_INFINITY, Math.hypot(Double.NEGATIVE_INFINITY, 514 Double.POSITIVE_INFINITY), 0D); 515 assertTrue("Should be NaN", Double.isNaN(Math.hypot(Double.NaN, 516 2342301.89843))); 517 assertTrue("Should be NaN", Double.isNaN(Math.hypot(-345.2680, 518 Double.NaN))); 519 520 assertEquals("Should return 2396424.905416697", 2396424.905416697, Math 521 .hypot(12322.12, -2396393.2258), 0D); 522 assertEquals("Should return 138.16958070558556", 138.16958070558556, 523 Math.hypot(-138.16951162, 0.13817035864), 0D); 524 assertEquals("Should return 1.7976931348623157E308", 525 1.7976931348623157E308, Math.hypot(Double.MAX_VALUE, 211370.35), 0D); 526 assertEquals("Should return 5413.7185", 5413.7185, Math.hypot( 527 -5413.7185, Double.MIN_VALUE), 0D); 528 } 529 530 /** 531 * java.lang.Math#IEEEremainder(double, double) 532 */ 533 public void test_IEEEremainderDD() { 534 // Test for method double java.lang.Math.IEEEremainder(double, double) 535 assertEquals("Incorrect remainder returned", 536 0.0, Math.IEEEremainder(1.0, 1.0), 0D); 537 assertTrue("Incorrect remainder returned", Math.IEEEremainder(1.32, 538 89.765) >= 1.4705063220631647E-2 539 || Math.IEEEremainder(1.32, 89.765) >= 1.4705063220631649E-2); 540 } 541 542 /** 543 * java.lang.Math#log(double) 544 */ 545 public void test_logD() { 546 // Test for method double java.lang.Math.log(double) 547 for (double d = 10; d >= -10; d -= 0.5) { 548 double answer = Math.log(Math.exp(d)); 549 assertTrue("Answer does not equal expected answer for d = " + d 550 + " answer = " + answer, Math.abs(answer - d) <= Math 551 .abs(d * 0.00000001)); 552 } 553 } 554 555 /** 556 * java.lang.Math#log10(double) 557 */ 558 @SuppressWarnings("boxing") 559 public void test_log10_D() { 560 // Test for special cases 561 assertTrue(Double.isNaN(Math.log10(Double.NaN))); 562 assertTrue(Double.isNaN(Math.log10(-2541.05745687234187532))); 563 assertTrue(Double.isNaN(Math.log10(-0.1))); 564 assertEquals(Double.POSITIVE_INFINITY, Math.log10(Double.POSITIVE_INFINITY)); 565 assertEquals(Double.NEGATIVE_INFINITY, Math.log10(0.0)); 566 assertEquals(Double.NEGATIVE_INFINITY, Math.log10(+0.0)); 567 assertEquals(Double.NEGATIVE_INFINITY, Math.log10(-0.0)); 568 569 assertEquals(3.0, Math.log10(1000.0)); 570 assertEquals(14.0, Math.log10(Math.pow(10, 14))); 571 assertEquals(3.7389561269540406, Math.log10(5482.2158)); 572 assertEquals(14.661551142893833, Math.log10(458723662312872.125782332587)); 573 assertEquals(-0.9083828622192334, Math.log10(0.12348583358871)); 574 assertEquals(308.25471555991675, Math.log10(Double.MAX_VALUE)); 575 assertEquals(-323.3062153431158, Math.log10(Double.MIN_VALUE)); 576 } 577 578 /** 579 * java.lang.Math#log1p(double) 580 */ 581 public void test_log1p_D() { 582 // Test for special cases 583 assertTrue("Should return NaN", Double.isNaN(Math.log1p(Double.NaN))); 584 assertTrue("Should return NaN", Double.isNaN(Math.log1p(-32.0482175))); 585 assertEquals("Should return POSITIVE_INFINITY", 586 Double.POSITIVE_INFINITY, Math.log1p(Double.POSITIVE_INFINITY), 0D); 587 assertEquals(Double.doubleToLongBits(0.0), Double.doubleToLongBits(Math 588 .log1p(0.0))); 589 assertEquals(Double.doubleToLongBits(+0.0), Double 590 .doubleToLongBits(Math.log1p(+0.0))); 591 assertEquals(Double.doubleToLongBits(-0.0), Double 592 .doubleToLongBits(Math.log1p(-0.0))); 593 594 assertEquals("Should return -0.2941782295312541", -0.2941782295312541, 595 Math.log1p(-0.254856327), 0D); 596 assertEquals("Should return 7.368050685564151", 7.368050685564151, Math 597 .log1p(1583.542), 0D); 598 assertEquals("Should return 0.4633708685409921", 0.4633708685409921, 599 Math.log1p(0.5894227), 0D); 600 assertEquals("Should return 709.782712893384", 709.782712893384, Math 601 .log1p(Double.MAX_VALUE), 0D); 602 assertEquals("Should return Double.MIN_VALUE", Double.MIN_VALUE, Math 603 .log1p(Double.MIN_VALUE), 0D); 604 } 605 606 public void test_maxDD_Math() { 607 test_maxDD(true /* use Math */); 608 } 609 610 public void test_maxDD_Double() { 611 test_maxDD(false /* use Math */); 612 } 613 614 /** 615 * java.lang.Math#max(double, double) 616 */ 617 private static void test_maxDD(boolean useMath) { 618 // Test for method double java.lang.Math.max(double, double) 619 assertEquals("Incorrect double max value", 1908897.6000089, 620 max(-1908897.6000089, 1908897.6000089, useMath), 0D); 621 assertEquals("Incorrect double max value", 622 1908897.6000089, max(2.0, 1908897.6000089, useMath), 0D); 623 assertEquals("Incorrect double max value", -2.0, max(-2.0, -1908897.6000089, useMath), 0D); 624 625 // Compare toString representations here since -0.0 = +0.0, and 626 // NaN != NaN and we need to distinguish 627 assertEquals("Max failed for NaN", 628 Double.toString(Double.NaN), Double.toString(max(Double.NaN, 42.0d, useMath))); 629 assertEquals("Max failed for NaN", 630 Double.toString(Double.NaN), Double.toString(max(42.0d, Double.NaN, useMath))); 631 assertEquals("Max failed for 0.0", 632 Double.toString(+0.0d), Double.toString(max(+0.0d, -0.0d, useMath))); 633 assertEquals("Max failed for 0.0", 634 Double.toString(+0.0d), Double.toString(max(-0.0d, +0.0d, useMath))); 635 assertEquals("Max failed for -0.0d", 636 Double.toString(-0.0d), Double.toString(max(-0.0d, -0.0d, useMath))); 637 assertEquals("Max failed for 0.0", 638 Double.toString(+0.0d), Double.toString(max(+0.0d, +0.0d, useMath))); 639 } 640 641 /** 642 * java.lang.Math#max(float, float) 643 */ 644 public void test_maxFF() { 645 // Test for method float java.lang.Math.max(float, float) 646 assertTrue("Incorrect float max value", Math.max(-1908897.600f, 647 1908897.600f) == 1908897.600f); 648 assertTrue("Incorrect float max value", 649 Math.max(2.0f, 1908897.600f) == 1908897.600f); 650 assertTrue("Incorrect float max value", 651 Math.max(-2.0f, -1908897.600f) == -2.0f); 652 653 // Compare toString representations here since -0.0 = +0.0, and 654 // NaN != NaN and we need to distinguish 655 assertEquals("Max failed for NaN", 656 Float.toString(Float.NaN), Float.toString(Math.max(Float.NaN, 42.0f))); 657 assertEquals("Max failed for NaN", 658 Float.toString(Float.NaN), Float.toString(Math.max(42.0f, Float.NaN))); 659 assertEquals("Max failed for 0.0", 660 Float.toString(+0.0f), Float.toString(Math.max(+0.0f, -0.0f))); 661 assertEquals("Max failed for 0.0", 662 Float.toString(+0.0f), Float.toString(Math.max(-0.0f, +0.0f))); 663 assertEquals("Max failed for -0.0f", 664 Float.toString(-0.0f), Float.toString(Math.max(-0.0f, -0.0f))); 665 assertEquals("Max failed for 0.0", 666 Float.toString(+0.0f), Float.toString(Math.max(+0.0f, +0.0f))); 667 } 668 669 /** 670 * java.lang.Math#max(int, int) 671 */ 672 public void test_maxII() { 673 // Test for method int java.lang.Math.max(int, int) 674 assertEquals("Incorrect int max value", 675 19088976, Math.max(-19088976, 19088976)); 676 assertEquals("Incorrect int max value", 677 19088976, Math.max(20, 19088976)); 678 assertEquals("Incorrect int max value", -20, Math.max(-20, -19088976)); 679 } 680 681 /** 682 * java.lang.Math#max(long, long) 683 */ 684 public void test_maxJJ() { 685 // Test for method long java.lang.Math.max(long, long) 686 assertEquals("Incorrect long max value", 19088976000089L, Math.max(-19088976000089L, 687 19088976000089L)); 688 assertEquals("Incorrect long max value", 689 19088976000089L, Math.max(20, 19088976000089L)); 690 assertEquals("Incorrect long max value", 691 -20, Math.max(-20, -19088976000089L)); 692 } 693 694 public void test_minDD_Math() { 695 test_minDD(true /* useMath */); 696 } 697 698 public void test_minDD_Double() { 699 test_minDD(false /* useMath */); 700 } 701 702 /** 703 * java.lang.Math#min(double, double) 704 */ 705 private static void test_minDD(boolean useMath) { 706 // Test for method double java.lang.Math.min(double, double) 707 assertEquals("Incorrect double min value", -1908897.6000089, 708 min(-1908897.6000089, 1908897.6000089, useMath), 0D); 709 assertEquals("Incorrect double min value", 710 2.0, min(2.0, 1908897.6000089, useMath), 0D); 711 assertEquals("Incorrect double min value", -1908897.6000089, 712 min(-2.0, -1908897.6000089, useMath), 0D); 713 assertEquals("Incorrect double min value", 1.0d, Math.min(1.0d, 1.0d)); 714 715 // Compare toString representations here since -0.0 = +0.0, and 716 // NaN != NaN and we need to distinguish 717 assertEquals("Min failed for NaN", 718 Double.toString(Double.NaN), Double.toString(min(Double.NaN, 42.0d, useMath))); 719 assertEquals("Min failed for NaN", 720 Double.toString(Double.NaN), Double.toString(min(42.0d, Double.NaN, useMath))); 721 assertEquals("Min failed for -0.0", 722 Double.toString(-0.0d), Double.toString(min(+0.0d, -0.0d, useMath))); 723 assertEquals("Min failed for -0.0", 724 Double.toString(-0.0d), Double.toString(min(-0.0d, +0.0d, useMath))); 725 assertEquals("Min failed for -0.0d", 726 Double.toString(-0.0d), Double.toString(min(-0.0d, -0.0d, useMath))); 727 assertEquals("Min failed for 0.0", 728 Double.toString(+0.0d), Double.toString(min(+0.0d, +0.0d, useMath))); 729 } 730 731 private static double min(double a, double b, boolean useMath) { 732 if (useMath) { 733 return Math.min(a, b); 734 } else { 735 return Double.min(a, b); 736 } 737 } 738 739 private static double max(double a, double b, boolean useMath) { 740 if (useMath) { 741 return Math.max(a, b); 742 } else { 743 return Double.max(a, b); 744 } 745 } 746 747 /** 748 * java.lang.Math#min(float, float) 749 */ 750 public void test_minFF() { 751 // Test for method float java.lang.Math.min(float, float) 752 assertTrue("Incorrect float min value", Math.min(-1908897.600f, 753 1908897.600f) == -1908897.600f); 754 assertTrue("Incorrect float min value", 755 Math.min(2.0f, 1908897.600f) == 2.0f); 756 assertTrue("Incorrect float min value", 757 Math.min(-2.0f, -1908897.600f) == -1908897.600f); 758 assertEquals("Incorrect float min value", 1.0f, Math.min(1.0f, 1.0f)); 759 760 // Compare toString representations here since -0.0 = +0.0, and 761 // NaN != NaN and we need to distinguish 762 assertEquals("Min failed for NaN", 763 Float.toString(Float.NaN), Float.toString(Math.min(Float.NaN, 42.0f))); 764 assertEquals("Min failed for NaN", 765 Float.toString(Float.NaN), Float.toString(Math.min(42.0f, Float.NaN))); 766 assertEquals("Min failed for -0.0", 767 Float.toString(-0.0f), Float.toString(Math.min(+0.0f, -0.0f))); 768 assertEquals("Min failed for -0.0", 769 Float.toString(-0.0f), Float.toString(Math.min(-0.0f, +0.0f))); 770 assertEquals("Min failed for -0.0f", 771 Float.toString(-0.0f), Float.toString(Math.min(-0.0f, -0.0f))); 772 assertEquals("Min failed for 0.0", 773 Float.toString(+0.0f), Float.toString(Math.min(+0.0f, +0.0f))); 774 } 775 776 /** 777 * java.lang.Math#min(int, int) 778 */ 779 public void test_minII() { 780 // Test for method int java.lang.Math.min(int, int) 781 assertEquals("Incorrect int min value", 782 -19088976, Math.min(-19088976, 19088976)); 783 assertEquals("Incorrect int min value", 20, Math.min(20, 19088976)); 784 assertEquals("Incorrect int min value", 785 -19088976, Math.min(-20, -19088976)); 786 787 } 788 789 /** 790 * java.lang.Math#min(long, long) 791 */ 792 public void test_minJJ() { 793 // Test for method long java.lang.Math.min(long, long) 794 assertEquals("Incorrect long min value", -19088976000089L, Math.min(-19088976000089L, 795 19088976000089L)); 796 assertEquals("Incorrect long min value", 797 20, Math.min(20, 19088976000089L)); 798 assertEquals("Incorrect long min value", 799 -19088976000089L, Math.min(-20, -19088976000089L)); 800 } 801 802 /** 803 * start number cases for test_nextAfter_DD in MathTest/StrictMathTest 804 * NEXTAFTER_DD_START_CASES[i][0] is the start number 805 * NEXTAFTER_DD_START_CASES[i][1] is the nextUp of start number 806 * NEXTAFTER_DD_START_CASES[i][2] is the nextDown of start number 807 */ 808 static final double NEXTAFTER_DD_START_CASES[][] = new double[][] { 809 { 3.4, 3.4000000000000004, 3.3999999999999995 }, 810 { -3.4, -3.3999999999999995, -3.4000000000000004 }, 811 { 3.4233E109, 3.4233000000000005E109, 3.4232999999999996E109 }, 812 { -3.4233E109, -3.4232999999999996E109, -3.4233000000000005E109 }, 813 { +0.0, Double.MIN_VALUE, -Double.MIN_VALUE }, 814 { 0.0, Double.MIN_VALUE, -Double.MIN_VALUE }, 815 { -0.0, Double.MIN_VALUE, -Double.MIN_VALUE }, 816 { Double.MIN_VALUE, 1.0E-323, +0.0 }, 817 { -Double.MIN_VALUE, -0.0, -1.0E-323 }, 818 { Double.MIN_NORMAL, 2.225073858507202E-308, 2.225073858507201E-308 }, 819 { -Double.MIN_NORMAL, -2.225073858507201E-308, 820 -2.225073858507202E-308 }, 821 { Double.MAX_VALUE, Double.POSITIVE_INFINITY, 822 1.7976931348623155E308 }, 823 { -Double.MAX_VALUE, -1.7976931348623155E308, 824 Double.NEGATIVE_INFINITY }, 825 { Double.POSITIVE_INFINITY, Double.POSITIVE_INFINITY, 826 Double.MAX_VALUE }, 827 { Double.NEGATIVE_INFINITY, -Double.MAX_VALUE, 828 Double.NEGATIVE_INFINITY } }; 829 830 /** 831 * direction number cases for test_nextAfter_DD/test_nextAfter_FD in 832 * MathTest/StrictMathTest 833 */ 834 static final double NEXTAFTER_DD_FD_DIRECTION_CASES[] = new double[] { 835 Double.POSITIVE_INFINITY, Double.MAX_VALUE, 8.8, 3.4, 1.4, 836 Double.MIN_NORMAL, Double.MIN_NORMAL / 2, Double.MIN_VALUE, +0.0, 837 0.0, -0.0, -Double.MIN_VALUE, -Double.MIN_NORMAL / 2, 838 -Double.MIN_NORMAL, -1.4, -3.4, -8.8, -Double.MAX_VALUE, 839 Double.NEGATIVE_INFINITY }; 840 841 /** 842 * {@link java.lang.Math#nextAfter(double, double)} 843 * @since 1.6 844 */ 845 @SuppressWarnings("boxing") 846 public void test_nextAfter_DD() { 847 // test for most cases without exception 848 for (int i = 0; i < NEXTAFTER_DD_START_CASES.length; i++) { 849 final double start = NEXTAFTER_DD_START_CASES[i][0]; 850 final long nextUpBits = Double 851 .doubleToLongBits(NEXTAFTER_DD_START_CASES[i][1]); 852 final long nextDownBits = Double 853 .doubleToLongBits(NEXTAFTER_DD_START_CASES[i][2]); 854 855 for (int j = 0; j < NEXTAFTER_DD_FD_DIRECTION_CASES.length; j++) { 856 final double direction = NEXTAFTER_DD_FD_DIRECTION_CASES[j]; 857 final long resultBits = Double.doubleToLongBits(Math.nextAfter( 858 start, direction)); 859 final long directionBits = Double.doubleToLongBits(direction); 860 if (direction > start) { 861 assertEquals("Result should be next up-number.", 862 nextUpBits, resultBits); 863 } else if (direction < start) { 864 assertEquals("Result should be next down-number.", 865 nextDownBits, resultBits); 866 } else { 867 assertEquals("Result should be direction.", directionBits, 868 resultBits); 869 } 870 } 871 } 872 873 // test for cases with NaN 874 for (int i = 0; i < NEXTAFTER_DD_START_CASES.length; i++) { 875 assertTrue("The result should be NaN.", Double.isNaN(Math 876 .nextAfter(NEXTAFTER_DD_START_CASES[i][0], Double.NaN))); 877 } 878 for (int i = 0; i < NEXTAFTER_DD_FD_DIRECTION_CASES.length; i++) { 879 assertTrue("The result should be NaN.", Double.isNaN(Math 880 .nextAfter(Double.NaN, NEXTAFTER_DD_FD_DIRECTION_CASES[i]))); 881 } 882 assertTrue("The result should be NaN.", Double.isNaN(Math.nextAfter( 883 Double.NaN, Double.NaN))); 884 885 // test for exception 886 try { 887 Math.nextAfter((Double) null, 2.3); 888 fail("Should throw NullPointerException"); 889 } catch (NullPointerException e) { 890 // Expected 891 } 892 try { 893 Math.nextAfter(2.3, (Double) null); 894 fail("Should throw NullPointerException"); 895 } catch (NullPointerException e) { 896 // Expected 897 } 898 try { 899 Math.nextAfter((Double) null, (Double) null); 900 fail("Should throw NullPointerException"); 901 } catch (NullPointerException e) { 902 // Expected 903 } 904 } 905 906 /** 907 * start number cases for test_nextAfter_FD in MathTest/StrictMathTest 908 * NEXTAFTER_FD_START_CASES[i][0] is the start number 909 * NEXTAFTER_FD_START_CASES[i][1] is the nextUp of start number 910 * NEXTAFTER_FD_START_CASES[i][2] is the nextDown of start number 911 */ 912 static final float NEXTAFTER_FD_START_CASES[][] = new float[][] { 913 { 3.4f, 3.4000003f, 3.3999999f }, 914 { -3.4f, -3.3999999f, -3.4000003f }, 915 { 3.4233E19f, 3.4233002E19f, 3.4232998E19f }, 916 { -3.4233E19f, -3.4232998E19f, -3.4233002E19f }, 917 { +0.0f, Float.MIN_VALUE, -Float.MIN_VALUE }, 918 { 0.0f, Float.MIN_VALUE, -Float.MIN_VALUE }, 919 { -0.0f, Float.MIN_VALUE, -Float.MIN_VALUE }, 920 { Float.MIN_VALUE, 2.8E-45f, +0.0f }, 921 { -Float.MIN_VALUE, -0.0f, -2.8E-45f }, 922 { Float.MIN_NORMAL, 1.1754945E-38f, 1.1754942E-38f }, 923 { -Float.MIN_NORMAL, -1.1754942E-38f, -1.1754945E-38f }, 924 { Float.MAX_VALUE, Float.POSITIVE_INFINITY, 3.4028233E38f }, 925 { -Float.MAX_VALUE, -3.4028233E38f, Float.NEGATIVE_INFINITY }, 926 { Float.POSITIVE_INFINITY, Float.POSITIVE_INFINITY, Float.MAX_VALUE }, 927 { Float.NEGATIVE_INFINITY, -Float.MAX_VALUE, 928 Float.NEGATIVE_INFINITY } }; 929 930 /** 931 * {@link java.lang.Math#nextAfter(float, double)} 932 * @since 1.6 933 */ 934 @SuppressWarnings("boxing") 935 public void test_nextAfter_FD() { 936 // test for most cases without exception 937 for (int i = 0; i < NEXTAFTER_FD_START_CASES.length; i++) { 938 final float start = NEXTAFTER_FD_START_CASES[i][0]; 939 final int nextUpBits = Float 940 .floatToIntBits(NEXTAFTER_FD_START_CASES[i][1]); 941 final int nextDownBits = Float 942 .floatToIntBits(NEXTAFTER_FD_START_CASES[i][2]); 943 944 for (int j = 0; j < NEXTAFTER_DD_FD_DIRECTION_CASES.length; j++) { 945 final double direction = NEXTAFTER_DD_FD_DIRECTION_CASES[j]; 946 final int resultBits = Float.floatToIntBits(Math.nextAfter( 947 start, direction)); 948 if (direction > start) { 949 assertEquals("Result should be next up-number.", 950 nextUpBits, resultBits); 951 } else if (direction < start) { 952 assertEquals("Result should be next down-number.", 953 nextDownBits, resultBits); 954 } else { 955 final int equivalentBits = Float.floatToIntBits(new Float( 956 direction)); 957 assertEquals( 958 "Result should be a number equivalent to direction.", 959 equivalentBits, resultBits); 960 } 961 } 962 } 963 964 // test for cases with NaN 965 for (int i = 0; i < NEXTAFTER_FD_START_CASES.length; i++) { 966 assertTrue("The result should be NaN.", Float.isNaN(Math.nextAfter( 967 NEXTAFTER_FD_START_CASES[i][0], Float.NaN))); 968 } 969 for (int i = 0; i < NEXTAFTER_DD_FD_DIRECTION_CASES.length; i++) { 970 assertTrue("The result should be NaN.", Float.isNaN(Math.nextAfter( 971 Float.NaN, NEXTAFTER_DD_FD_DIRECTION_CASES[i]))); 972 } 973 assertTrue("The result should be NaN.", Float.isNaN(Math.nextAfter( 974 Float.NaN, Float.NaN))); 975 976 // test for exception 977 try { 978 Math.nextAfter((Float) null, 2.3); 979 fail("Should throw NullPointerException"); 980 } catch (NullPointerException e) { 981 // Expected 982 } 983 try { 984 Math.nextAfter(2.3, (Float) null); 985 fail("Should throw NullPointerException"); 986 } catch (NullPointerException e) { 987 // Expected 988 } 989 try { 990 Math.nextAfter((Float) null, (Float) null); 991 fail("Should throw NullPointerException"); 992 } catch (NullPointerException e) { 993 // Expected 994 } 995 } 996 997 /** 998 * {@link java.lang.Math#nextUp(double)} 999 * @since 1.6 1000 */ 1001 @SuppressWarnings("boxing") 1002 public void test_nextUp_D() { 1003 // This method is semantically equivalent to nextAfter(d, 1004 // Double.POSITIVE_INFINITY), 1005 // so we use the data of test_nextAfter_DD 1006 for (int i = 0; i < NEXTAFTER_DD_START_CASES.length; i++) { 1007 final double start = NEXTAFTER_DD_START_CASES[i][0]; 1008 final long nextUpBits = Double 1009 .doubleToLongBits(NEXTAFTER_DD_START_CASES[i][1]); 1010 final long resultBits = Double.doubleToLongBits(Math.nextUp(start)); 1011 assertEquals("Result should be next up-number.", nextUpBits, 1012 resultBits); 1013 } 1014 1015 // test for cases with NaN 1016 assertTrue("The result should be NaN.", Double.isNaN(Math 1017 .nextUp(Double.NaN))); 1018 1019 // test for exception 1020 try { 1021 Math.nextUp((Double) null); 1022 fail("Should throw NullPointerException"); 1023 } catch (NullPointerException e) { 1024 // Expected 1025 } 1026 } 1027 1028 /** 1029 * {@link java.lang.Math#nextUp(float)} 1030 * @since 1.6 1031 */ 1032 @SuppressWarnings("boxing") 1033 public void test_nextUp_F() { 1034 // This method is semantically equivalent to nextAfter(f, 1035 // Float.POSITIVE_INFINITY), 1036 // so we use the data of test_nextAfter_FD 1037 for (int i = 0; i < NEXTAFTER_FD_START_CASES.length; i++) { 1038 final float start = NEXTAFTER_FD_START_CASES[i][0]; 1039 final int nextUpBits = Float 1040 .floatToIntBits(NEXTAFTER_FD_START_CASES[i][1]); 1041 final int resultBits = Float.floatToIntBits(Math.nextUp(start)); 1042 assertEquals("Result should be next up-number.", nextUpBits, 1043 resultBits); 1044 } 1045 1046 // test for cases with NaN 1047 assertTrue("The result should be NaN.", Float.isNaN(Math 1048 .nextUp(Float.NaN))); 1049 1050 // test for exception 1051 try { 1052 Math.nextUp((Float) null); 1053 fail("Should throw NullPointerException"); 1054 } catch (NullPointerException e) { 1055 // Expected 1056 } 1057 } 1058 1059 /** 1060 * {@link java.lang.Math#nextDown(double)} 1061 * @since 1.8 1062 */ 1063 @SuppressWarnings("boxing") 1064 public void test_nextDown_D() { 1065 // This method is semantically equivalent to nextAfter(d, 1066 // Double.NEGATIVE_INFINITY), 1067 // so we use the data of test_nextAfter_DD 1068 for (int i = 0; i < NEXTAFTER_DD_START_CASES.length; i++) { 1069 final double start = NEXTAFTER_DD_START_CASES[i][0]; 1070 final long nextDownBits = Double 1071 .doubleToLongBits(NEXTAFTER_DD_START_CASES[i][2]); 1072 final long resultBits = Double.doubleToLongBits(Math.nextDown(start)); 1073 assertEquals("Result should be next down-number.", nextDownBits, 1074 resultBits); 1075 } 1076 1077 // test for cases with NaN 1078 assertTrue("The result should be NaN.", Double.isNaN(Math 1079 .nextDown(Double.NaN))); 1080 1081 // test for exception 1082 try { 1083 Math.nextDown((Double) null); 1084 fail("Should throw NullPointerException"); 1085 } catch (NullPointerException e) { 1086 // Expected 1087 } 1088 } 1089 1090 /** 1091 * {@link java.lang.Math#nextDown(float)} 1092 * @since 1.8 1093 */ 1094 @SuppressWarnings("boxing") 1095 public void test_nextDown_F() { 1096 // This method is semantically equivalent to nextAfter(f, 1097 // Float.NEGATIVE_INFINITY), 1098 // so we use the data of test_nextAfter_FD 1099 for (int i = 0; i < NEXTAFTER_FD_START_CASES.length; i++) { 1100 final float start = NEXTAFTER_FD_START_CASES[i][0]; 1101 final int nextDownBits = Float 1102 .floatToIntBits(NEXTAFTER_FD_START_CASES[i][2]); 1103 final int resultBits = Float.floatToIntBits(Math.nextDown(start)); 1104 assertEquals("Result should be next down-number.", nextDownBits, 1105 resultBits); 1106 } 1107 1108 // test for cases with NaN 1109 assertTrue("The result should be NaN.", Float.isNaN(Math 1110 .nextDown(Float.NaN))); 1111 1112 // test for exception 1113 try { 1114 Math.nextDown((Float) null); 1115 fail("Should throw NullPointerException"); 1116 } catch (NullPointerException e) { 1117 // Expected 1118 } 1119 } 1120 1121 /** 1122 * java.lang.Math#pow(double, double) 1123 */ 1124 public void test_powDD() { 1125 // Test for method double java.lang.Math.pow(double, double) 1126 double NZERO = longTodouble(doubleTolong(0.0) ^ 0x8000000000000000L); 1127 double p1 = 1.0; 1128 double p2 = 2.0; 1129 double p3 = 3.0; 1130 double p4 = 4.0; 1131 double p5 = 5.0; 1132 double p6 = 6.0; 1133 double p7 = 7.0; 1134 double p8 = 8.0; 1135 double p9 = 9.0; 1136 double p10 = 10.0; 1137 double p11 = 11.0; 1138 double p12 = 12.0; 1139 double p13 = 13.0; 1140 double p14 = 14.0; 1141 double p15 = 15.0; 1142 double p16 = 16.0; 1143 double[] values = { p1, p2, p3, p4, p5, p6, p7, p8, p9, p10, p11, p12, 1144 p13, p14, p15, p16 }; 1145 1146 for (int x = 0; x < values.length; x++) { 1147 double dval = values[x]; 1148 double negateDval = negateDouble(dval); 1149 1150 // If the second argument is positive or negative zero, then the 1151 // result is 1.0. 1152 assertEquals("Result should be Math.pow(" + dval 1153 + ",-0.0)=+1.0", 1.0, Math.pow(dval, NZERO)); 1154 assertEquals("Result should be Math.pow(" + negateDval 1155 + ",-0.0)=+1.0", 1.0, Math.pow(negateDval, NZERO)); 1156 assertEquals("Result should be Math.pow(" + dval 1157 + ",+0.0)=+1.0", 1.0, Math.pow(dval, +0.0)); 1158 assertEquals("Result should be Math.pow(" + negateDval 1159 + ",+0.0)=+1.0", 1.0, Math.pow(negateDval, +0.0)); 1160 1161 // If the second argument is 1.0, then the result is the same as the 1162 // first argument. 1163 assertEquals("Result should be Math.pow(" + dval + "," + 1.0 + ")=" 1164 + dval, dval, Math.pow(dval, 1.0)); 1165 assertEquals("Result should be Math.pow(" + negateDval + "," + 1.0 1166 + ")=" + negateDval, negateDval, Math.pow(negateDval, 1.0)); 1167 1168 // If the second argument is NaN, then the result is NaN. 1169 assertEquals("Result should be Math.pow(" + dval + "," + Double.NaN 1170 + ")=" + Double.NaN, Double.NaN, Math.pow(dval, Double.NaN)); 1171 assertEquals("Result should be Math.pow(" + negateDval + "," 1172 + Double.NaN + ")=" + Double.NaN, Double.NaN, Math.pow(negateDval, 1173 Double.NaN)); 1174 1175 if (dval > 1) { 1176 // If the first argument is NaN and the second argument is 1177 // nonzero, 1178 // then the result is NaN. 1179 assertEquals("Result should be Math.pow(" + Double.NaN + "," 1180 + dval + ")=" + Double.NaN, Double.NaN, Math.pow(Double.NaN, dval)); 1181 assertEquals("Result should be Math.pow(" + Double.NaN + "," 1182 + negateDval + ")=" + Double.NaN, Double.NaN, Math.pow(Double.NaN, 1183 negateDval)); 1184 1185 /* 1186 * If the first argument is positive zero and the second 1187 * argument is greater than zero, or the first argument is 1188 * positive infinity and the second argument is less than zero, 1189 * then the result is positive zero. 1190 */ 1191 assertEquals("Result should be Math.pow(" + 0.0 + "," + dval 1192 + ")=" + 0.0, +0.0, Math.pow(0.0, dval)); 1193 assertEquals("Result should be Math.pow(" 1194 + Double.POSITIVE_INFINITY + "," + negateDval + ")=" 1195 + 0.0, +0.0, Math.pow(Double.POSITIVE_INFINITY, negateDval)); 1196 1197 /* 1198 * If the first argument is positive zero and the second 1199 * argument is less than zero, or the first argument is positive 1200 * infinity and the second argument is greater than zero, then 1201 * the result is positive infinity. 1202 */ 1203 assertEquals("Result should be Math.pow(" + 0.0 + "," 1204 + negateDval + ")=" + Double.POSITIVE_INFINITY, Double.POSITIVE_INFINITY, 1205 Math.pow(0.0, negateDval)); 1206 assertEquals("Result should be Math.pow(" 1207 + Double.POSITIVE_INFINITY + "," + dval + ")=" 1208 + Double.POSITIVE_INFINITY, Double.POSITIVE_INFINITY, Math.pow( 1209 Double.POSITIVE_INFINITY, dval)); 1210 1211 // Not a finite odd integer 1212 if (dval % 2 == 0) { 1213 /* 1214 * If the first argument is negative zero and the second 1215 * argument is greater than zero but not a finite odd 1216 * integer, or the first argument is negative infinity and 1217 * the second argument is less than zero but not a finite 1218 * odd integer, then the result is positive zero. 1219 */ 1220 assertEquals("Result should be Math.pow(" + NZERO + "," 1221 + dval + ")=" + 0.0, +0.0, Math.pow(NZERO, dval)); 1222 assertEquals("Result should be Math.pow(" 1223 + Double.NEGATIVE_INFINITY + "," + negateDval 1224 + ")=" + 0.0, +0.0, Math.pow(Double.NEGATIVE_INFINITY, 1225 negateDval)); 1226 1227 /* 1228 * If the first argument is negative zero and the second 1229 * argument is less than zero but not a finite odd integer, 1230 * or the first argument is negative infinity and the second 1231 * argument is greater than zero but not a finite odd 1232 * integer, then the result is positive infinity. 1233 */ 1234 assertEquals("Result should be Math.pow(" + NZERO + "," 1235 + negateDval + ")=" + Double.POSITIVE_INFINITY, Double.POSITIVE_INFINITY, 1236 Math.pow(NZERO, negateDval)); 1237 assertEquals("Result should be Math.pow(" 1238 + Double.NEGATIVE_INFINITY + "," + dval + ")=" 1239 + Double.POSITIVE_INFINITY, Double.POSITIVE_INFINITY, Math.pow( 1240 Double.NEGATIVE_INFINITY, dval)); 1241 } 1242 1243 // finite odd integer 1244 if (dval % 2 != 0) { 1245 /* 1246 * If the first argument is negative zero and the second 1247 * argument is a positive finite odd integer, or the first 1248 * argument is negative infinity and the second argument is 1249 * a negative finite odd integer, then the result is 1250 * negative zero. 1251 */ 1252 assertEquals("Result should be Math.pow(" + NZERO + "," 1253 + dval + ")=" + NZERO, NZERO, Math.pow(NZERO, dval)); 1254 assertEquals("Result should be Math.pow(" 1255 + Double.NEGATIVE_INFINITY + "," + negateDval 1256 + ")=" + NZERO, NZERO, Math.pow(Double.NEGATIVE_INFINITY, 1257 negateDval)); 1258 /* 1259 * If the first argument is negative zero and the second 1260 * argument is a negative finite odd integer, or the first 1261 * argument is negative infinity and the second argument is 1262 * a positive finite odd integer then the result is negative 1263 * infinity. 1264 */ 1265 assertEquals("Result should be Math.pow(" + NZERO + "," 1266 + negateDval + ")=" + Double.NEGATIVE_INFINITY, Double.NEGATIVE_INFINITY, 1267 Math.pow(NZERO, negateDval)); 1268 assertEquals("Result should be Math.pow(" 1269 + Double.NEGATIVE_INFINITY + "," + dval + ")=" 1270 + Double.NEGATIVE_INFINITY, Double.NEGATIVE_INFINITY, Math.pow( 1271 Double.NEGATIVE_INFINITY, dval)); 1272 } 1273 1274 /** 1275 * 1. If the first argument is finite and less than zero if the 1276 * second argument is a finite even integer, the result is equal 1277 * to the result of raising the absolute value of the first 1278 * argument to the power of the second argument 1279 * 1280 * 2. if the second argument is a finite odd integer, the result is equal to the 1281 * negative of the result of raising the absolute value of the 1282 * first argument to the power of the second argument 1283 * 1284 * 3. if the second argument is finite and not an integer, then the result 1285 * is NaN. 1286 */ 1287 for (int j = 1; j < values.length; j++) { 1288 double jval = values[j]; 1289 if (jval % 2.0 == 0.0) { 1290 assertEquals("" + negateDval + " " + jval, Math.pow( 1291 dval, jval), Math.pow(negateDval, jval)); 1292 } else { 1293 assertEquals("" + negateDval + " " + jval, -1.0 1294 * Math.pow(dval, jval), Math.pow(negateDval, 1295 jval)); 1296 } 1297 assertEquals(Double.NaN, Math 1298 .pow(negateDval, jval / 0.5467)); 1299 assertEquals(Double.NaN, Math.pow(negateDval, -1.0 * jval 1300 / 0.5467)); 1301 } 1302 } 1303 1304 // If the absolute value of the first argument equals 1 and the 1305 // second argument is infinite, then the result is NaN. 1306 if (dval == 1) { 1307 assertEquals("Result should be Math.pow(" + dval + "," 1308 + Double.POSITIVE_INFINITY + ")=" + Double.NaN, Double.NaN, Math 1309 .pow(dval, Double.POSITIVE_INFINITY)); 1310 assertEquals("Result should be Math.pow(" + dval + "," 1311 + Double.NEGATIVE_INFINITY + ")=" + Double.NaN, Double.NaN, Math 1312 .pow(dval, Double.NEGATIVE_INFINITY)); 1313 1314 assertEquals("Result should be Math.pow(" + negateDval + "," 1315 + Double.POSITIVE_INFINITY + ")=" + Double.NaN, Double.NaN, Math 1316 .pow(negateDval, Double.POSITIVE_INFINITY)); 1317 assertEquals("Result should be Math.pow(" + negateDval + "," 1318 + Double.NEGATIVE_INFINITY + ")=" + Double.NaN, Double.NaN, Math 1319 .pow(negateDval, Double.NEGATIVE_INFINITY)); 1320 } 1321 1322 if (dval > 1) { 1323 /* 1324 * If the absolute value of the first argument is greater than 1 1325 * and the second argument is positive infinity, or the absolute 1326 * value of the first argument is less than 1 and the second 1327 * argument is negative infinity, then the result is positive 1328 * infinity. 1329 */ 1330 assertEquals("Result should be Math.pow(" + dval + "," 1331 + Double.POSITIVE_INFINITY + ")=" 1332 + Double.POSITIVE_INFINITY, Double.POSITIVE_INFINITY, Math.pow(dval, 1333 Double.POSITIVE_INFINITY)); 1334 1335 assertEquals("Result should be Math.pow(" + negateDval + "," 1336 + Double.NEGATIVE_INFINITY + ")=" 1337 + Double.POSITIVE_INFINITY, Double.POSITIVE_INFINITY, Math.pow(-0.13456, 1338 Double.NEGATIVE_INFINITY)); 1339 1340 /* 1341 * If the absolute value of the first argument is greater than 1 1342 * and the second argument is negative infinity, or the absolute 1343 * value of the first argument is less than 1 and the second 1344 * argument is positive infinity, then the result is positive 1345 * zero. 1346 */ 1347 assertEquals("Result should be Math.pow(" + dval + "," 1348 + Double.NEGATIVE_INFINITY + ")= +0.0", +0.0, Math.pow(dval, 1349 Double.NEGATIVE_INFINITY)); 1350 assertEquals("Result should be Math.pow(" + negateDval + "," 1351 + Double.POSITIVE_INFINITY + ")= +0.0", +0.0, Math.pow( 1352 -0.13456, Double.POSITIVE_INFINITY)); 1353 } 1354 1355 assertEquals("Result should be Math.pow(" + 0.0 + "," + dval + ")=" 1356 + 0.0, 0.0, Math.pow(0.0, dval)); 1357 assertEquals("Result should be Math.pow(" + Double.NaN + "," + dval 1358 + ")=" + Double.NaN, Double.NaN, Math.pow(Double.NaN, dval)); 1359 } 1360 assertTrue("pow returned incorrect value", 1361 (long) Math.pow(2, 8) == 256l); 1362 assertTrue("pow returned incorrect value", 1363 Math.pow(2, -8) == 0.00390625d); 1364 assertEquals("Incorrect root returned1", 1365 2, Math.sqrt(Math.pow(Math.sqrt(2), 4)), 0); 1366 1367 assertEquals(Double.NEGATIVE_INFINITY, Math.pow(-10.0, 3.093403029238847E15)); 1368 assertEquals(Double.POSITIVE_INFINITY, Math.pow(10.0, 3.093403029238847E15)); 1369 } 1370 1371 private double longTodouble(long longvalue) { 1372 return Double.longBitsToDouble(longvalue); 1373 } 1374 1375 private long doubleTolong(double doublevalue) { 1376 return Double.doubleToLongBits(doublevalue); 1377 } 1378 1379 private double negateDouble(double doublevalue) { 1380 return doublevalue * -1.0; 1381 } 1382 1383 /** 1384 * java.lang.Math#rint(double) 1385 */ 1386 public void test_rintD() { 1387 // Test for method double java.lang.Math.rint(double) 1388 assertEquals("Failed to round properly - up to odd", 1389 3.0, Math.rint(2.9), 0D); 1390 assertTrue("Failed to round properly - NaN", Double.isNaN(Math 1391 .rint(Double.NaN))); 1392 assertEquals("Failed to round properly down to even", 1393 2.0, Math.rint(2.1), 0D); 1394 assertTrue("Failed to round properly " + 2.5 + " to even", Math 1395 .rint(2.5) == 2.0); 1396 assertTrue("Failed to round properly " + (+0.0d), 1397 Math.rint(+0.0d) == +0.0d); 1398 assertTrue("Failed to round properly " + (-0.0d), 1399 Math.rint(-0.0d) == -0.0d); 1400 } 1401 1402 /** 1403 * java.lang.Math#round(double) 1404 */ 1405 public void test_roundD() { 1406 // Test for method long java.lang.Math.round(double) 1407 assertEquals("Incorrect rounding of a float", -91, Math.round(-90.89d)); 1408 } 1409 1410 /** 1411 * java.lang.Math#round(float) 1412 */ 1413 public void test_roundF() { 1414 // Test for method int java.lang.Math.round(float) 1415 assertEquals("Incorrect rounding of a float", -91, Math.round(-90.89f)); 1416 } 1417 1418 /** 1419 * {@link java.lang.Math#scalb(double, int)} 1420 * @since 1.6 1421 */ 1422 @SuppressWarnings("boxing") 1423 public void test_scalb_DI() { 1424 // result is normal 1425 assertEquals(4.1422946304E7, Math.scalb(1.2345, 25)); 1426 assertEquals(3.679096698760986E-8, Math.scalb(1.2345, -25)); 1427 assertEquals(1.2345, Math.scalb(1.2345, 0)); 1428 assertEquals(7868514.304, Math.scalb(0.2345, 25)); 1429 1430 double normal = Math.scalb(0.2345, -25); 1431 assertEquals(6.98864459991455E-9, normal); 1432 // precision kept 1433 assertEquals(0.2345, Math.scalb(normal, 25)); 1434 1435 assertEquals(0.2345, Math.scalb(0.2345, 0)); 1436 assertEquals(-4.1422946304E7, Math.scalb(-1.2345, 25)); 1437 assertEquals(-6.98864459991455E-9, Math.scalb(-0.2345, -25)); 1438 assertEquals(2.0, Math.scalb(Double.MIN_NORMAL / 2, 1024)); 1439 assertEquals(64.0, Math.scalb(Double.MIN_VALUE, 1080)); 1440 assertEquals(234, Math.getExponent(Math.scalb(1.0, 234))); 1441 assertEquals(3.9999999999999996, Math.scalb(Double.MAX_VALUE, 1442 Double.MIN_EXPONENT)); 1443 1444 // result is near infinity 1445 double halfMax = Math.scalb(1.0, Double.MAX_EXPONENT); 1446 assertEquals(8.98846567431158E307, halfMax); 1447 assertEquals(Double.MAX_VALUE, halfMax - Math.ulp(halfMax) + halfMax); 1448 assertEquals(Double.POSITIVE_INFINITY, halfMax + halfMax); 1449 assertEquals(1.7976931348623155E308, Math.scalb(1.0 - Math.ulp(1.0), 1450 Double.MAX_EXPONENT + 1)); 1451 assertEquals(Double.POSITIVE_INFINITY, Math.scalb(1.0 - Math.ulp(1.0), 1452 Double.MAX_EXPONENT + 2)); 1453 1454 halfMax = Math.scalb(-1.0, Double.MAX_EXPONENT); 1455 assertEquals(-8.98846567431158E307, halfMax); 1456 assertEquals(-Double.MAX_VALUE, halfMax + Math.ulp(halfMax) + halfMax); 1457 assertEquals(Double.NEGATIVE_INFINITY, halfMax + halfMax); 1458 1459 assertEquals(Double.POSITIVE_INFINITY, Math.scalb(0.345, 1234)); 1460 assertEquals(Double.POSITIVE_INFINITY, Math.scalb(44.345E102, 934)); 1461 assertEquals(Double.NEGATIVE_INFINITY, Math.scalb(-44.345E102, 934)); 1462 1463 assertEquals(Double.POSITIVE_INFINITY, Math.scalb( 1464 Double.MIN_NORMAL / 2, 4000)); 1465 assertEquals(Double.POSITIVE_INFINITY, Math.scalb(Double.MIN_VALUE, 1466 8000)); 1467 assertEquals(Double.POSITIVE_INFINITY, Math.scalb(Double.MAX_VALUE, 1)); 1468 assertEquals(Double.POSITIVE_INFINITY, Math.scalb( 1469 Double.POSITIVE_INFINITY, 0)); 1470 assertEquals(Double.POSITIVE_INFINITY, Math.scalb( 1471 Double.POSITIVE_INFINITY, -1)); 1472 assertEquals(Double.NEGATIVE_INFINITY, Math.scalb( 1473 Double.NEGATIVE_INFINITY, -1)); 1474 assertEquals(Double.NEGATIVE_INFINITY, Math.scalb( 1475 Double.NEGATIVE_INFINITY, Double.MIN_EXPONENT)); 1476 1477 // result is subnormal/zero 1478 long posZeroBits = Double.doubleToLongBits(+0.0); 1479 long negZeroBits = Double.doubleToLongBits(-0.0); 1480 assertEquals(posZeroBits, Double.doubleToLongBits(Math.scalb(+0.0, 1481 Integer.MAX_VALUE))); 1482 assertEquals(posZeroBits, Double.doubleToLongBits(Math 1483 .scalb(+0.0, -123))); 1484 assertEquals(posZeroBits, Double.doubleToLongBits(Math.scalb(+0.0, 0))); 1485 assertEquals(negZeroBits, Double 1486 .doubleToLongBits(Math.scalb(-0.0, 123))); 1487 assertEquals(negZeroBits, Double.doubleToLongBits(Math.scalb(-0.0, 1488 Integer.MIN_VALUE))); 1489 1490 assertEquals(Double.MIN_VALUE, Math.scalb(1.0, -1074)); 1491 assertEquals(posZeroBits, Double.doubleToLongBits(Math 1492 .scalb(1.0, -1075))); 1493 assertEquals(negZeroBits, Double.doubleToLongBits(Math.scalb(-1.0, 1494 -1075))); 1495 1496 // precision lost 1497 assertEquals(Math.scalb(21.405, -1078), Math.scalb(21.405, -1079)); 1498 assertEquals(Double.MIN_VALUE, Math.scalb(21.405, -1079)); 1499 assertEquals(-Double.MIN_VALUE, Math.scalb(-21.405, -1079)); 1500 assertEquals(posZeroBits, Double.doubleToLongBits(Math.scalb(21.405, 1501 -1080))); 1502 assertEquals(negZeroBits, Double.doubleToLongBits(Math.scalb(-21.405, 1503 -1080))); 1504 assertEquals(posZeroBits, Double.doubleToLongBits(Math.scalb( 1505 Double.MIN_VALUE, -1))); 1506 assertEquals(negZeroBits, Double.doubleToLongBits(Math.scalb( 1507 -Double.MIN_VALUE, -1))); 1508 assertEquals(Double.MIN_VALUE, Math.scalb(Double.MIN_NORMAL, -52)); 1509 assertEquals(posZeroBits, Double.doubleToLongBits(Math.scalb( 1510 Double.MIN_NORMAL, -53))); 1511 assertEquals(negZeroBits, Double.doubleToLongBits(Math.scalb( 1512 -Double.MIN_NORMAL, -53))); 1513 assertEquals(Double.MIN_VALUE, Math.scalb(Double.MAX_VALUE, -2098)); 1514 assertEquals(posZeroBits, Double.doubleToLongBits(Math.scalb( 1515 Double.MAX_VALUE, -2099))); 1516 assertEquals(negZeroBits, Double.doubleToLongBits(Math.scalb( 1517 -Double.MAX_VALUE, -2099))); 1518 assertEquals(Double.MIN_VALUE, Math.scalb(Double.MIN_NORMAL / 3, -51)); 1519 assertEquals(posZeroBits, Double.doubleToLongBits(Math.scalb( 1520 Double.MIN_NORMAL / 3, -52))); 1521 assertEquals(negZeroBits, Double.doubleToLongBits(Math.scalb( 1522 -Double.MIN_NORMAL / 3, -52))); 1523 double subnormal = Math.scalb(Double.MIN_NORMAL / 3, -25); 1524 assertEquals(2.2104123E-316, subnormal); 1525 // precision lost 1526 assertFalse(Double.MIN_NORMAL / 3 == Math.scalb(subnormal, 25)); 1527 1528 // NaN 1529 assertTrue(Double.isNaN(Math.scalb(Double.NaN, 1))); 1530 assertTrue(Double.isNaN(Math.scalb(Double.NaN, 0))); 1531 assertTrue(Double.isNaN(Math.scalb(Double.NaN, -120))); 1532 1533 assertEquals(1283457024, Double.doubleToLongBits(Math.scalb( 1534 Double.MIN_VALUE * 153, 23))); 1535 assertEquals(-9223372035571318784L, Double.doubleToLongBits(Math.scalb( 1536 -Double.MIN_VALUE * 153, 23))); 1537 assertEquals(36908406321184768L, Double.doubleToLongBits(Math.scalb( 1538 Double.MIN_VALUE * 153, 52))); 1539 assertEquals(-9186463630533591040L, Double.doubleToLongBits(Math.scalb( 1540 -Double.MIN_VALUE * 153, 52))); 1541 1542 // test for exception 1543 try { 1544 Math.scalb((Double) null, (Integer) null); 1545 fail("Should throw NullPointerException"); 1546 } catch (NullPointerException e) { 1547 // Expected 1548 } 1549 try { 1550 Math.scalb(1.0, (Integer) null); 1551 fail("Should throw NullPointerException"); 1552 } catch (NullPointerException e) { 1553 // Expected 1554 } 1555 try { 1556 Math.scalb((Double) null, 1); 1557 fail("Should throw NullPointerException"); 1558 } catch (NullPointerException e) { 1559 // Expected 1560 } 1561 1562 long b1em1022 = 0x0010000000000000L; // bit representation of 1563 // Double.MIN_NORMAL 1564 long b1em1023 = 0x0008000000000000L; // bit representation of half of 1565 // Double.MIN_NORMAL 1566 // assert exact identity 1567 assertEquals(b1em1023, Double.doubleToLongBits(Math.scalb(Double 1568 .longBitsToDouble(b1em1022), -1))); 1569 } 1570 1571 /** 1572 * {@link java.lang.Math#scalb(float, int)} 1573 * @since 1.6 1574 */ 1575 @SuppressWarnings("boxing") 1576 public void test_scalb_FI() { 1577 // result is normal 1578 assertEquals(4.1422946304E7f, Math.scalb(1.2345f, 25)); 1579 assertEquals(3.679096698760986E-8f, Math.scalb(1.2345f, -25)); 1580 assertEquals(1.2345f, Math.scalb(1.2345f, 0)); 1581 assertEquals(7868514.304f, Math.scalb(0.2345f, 25)); 1582 1583 float normal = Math.scalb(0.2345f, -25); 1584 assertEquals(6.98864459991455E-9f, normal); 1585 // precision kept 1586 assertEquals(0.2345f, Math.scalb(normal, 25)); 1587 1588 assertEquals(0.2345f, Math.scalb(0.2345f, 0)); 1589 assertEquals(-4.1422946304E7f, Math.scalb(-1.2345f, 25)); 1590 assertEquals(-6.98864459991455E-9f, Math.scalb(-0.2345f, -25)); 1591 assertEquals(2.0f, Math.scalb(Float.MIN_NORMAL / 2, 128)); 1592 assertEquals(64.0f, Math.scalb(Float.MIN_VALUE, 155)); 1593 assertEquals(34, Math.getExponent(Math.scalb(1.0f, 34))); 1594 assertEquals(3.9999998f, Math 1595 .scalb(Float.MAX_VALUE, Float.MIN_EXPONENT)); 1596 1597 // result is near infinity 1598 float halfMax = Math.scalb(1.0f, Float.MAX_EXPONENT); 1599 assertEquals(1.7014118E38f, halfMax); 1600 assertEquals(Float.MAX_VALUE, halfMax - Math.ulp(halfMax) + halfMax); 1601 assertEquals(Float.POSITIVE_INFINITY, halfMax + halfMax); 1602 assertEquals(3.4028233E38f, Math.scalb(1.0f - Math.ulp(1.0f), 1603 Float.MAX_EXPONENT + 1)); 1604 assertEquals(Float.POSITIVE_INFINITY, Math.scalb(1.0f - Math.ulp(1.0f), 1605 Float.MAX_EXPONENT + 2)); 1606 1607 halfMax = Math.scalb(-1.0f, Float.MAX_EXPONENT); 1608 assertEquals(-1.7014118E38f, halfMax); 1609 assertEquals(-Float.MAX_VALUE, halfMax + Math.ulp(halfMax) + halfMax); 1610 assertEquals(Float.NEGATIVE_INFINITY, halfMax + halfMax); 1611 1612 assertEquals(Float.POSITIVE_INFINITY, Math.scalb(0.345f, 1234)); 1613 assertEquals(Float.POSITIVE_INFINITY, Math.scalb(44.345E10f, 934)); 1614 assertEquals(Float.NEGATIVE_INFINITY, Math.scalb(-44.345E10f, 934)); 1615 1616 assertEquals(Float.POSITIVE_INFINITY, Math.scalb(Float.MIN_NORMAL / 2, 1617 400)); 1618 assertEquals(Float.POSITIVE_INFINITY, Math.scalb(Float.MIN_VALUE, 800)); 1619 assertEquals(Float.POSITIVE_INFINITY, Math.scalb(Float.MAX_VALUE, 1)); 1620 assertEquals(Float.POSITIVE_INFINITY, Math.scalb( 1621 Float.POSITIVE_INFINITY, 0)); 1622 assertEquals(Float.POSITIVE_INFINITY, Math.scalb( 1623 Float.POSITIVE_INFINITY, -1)); 1624 assertEquals(Float.NEGATIVE_INFINITY, Math.scalb( 1625 Float.NEGATIVE_INFINITY, -1)); 1626 assertEquals(Float.NEGATIVE_INFINITY, Math.scalb( 1627 Float.NEGATIVE_INFINITY, Float.MIN_EXPONENT)); 1628 1629 // result is subnormal/zero 1630 int posZeroBits = Float.floatToIntBits(+0.0f); 1631 int negZeroBits = Float.floatToIntBits(-0.0f); 1632 assertEquals(posZeroBits, Float.floatToIntBits(Math.scalb(+0.0f, 1633 Integer.MAX_VALUE))); 1634 assertEquals(posZeroBits, Float.floatToIntBits(Math.scalb(+0.0f, -123))); 1635 assertEquals(posZeroBits, Float.floatToIntBits(Math.scalb(+0.0f, 0))); 1636 assertEquals(negZeroBits, Float.floatToIntBits(Math.scalb(-0.0f, 123))); 1637 assertEquals(negZeroBits, Float.floatToIntBits(Math.scalb(-0.0f, 1638 Integer.MIN_VALUE))); 1639 1640 assertEquals(Float.MIN_VALUE, Math.scalb(1.0f, -149)); 1641 assertEquals(posZeroBits, Float.floatToIntBits(Math.scalb(1.0f, -150))); 1642 assertEquals(negZeroBits, Float.floatToIntBits(Math.scalb(-1.0f, -150))); 1643 1644 // precision lost 1645 assertEquals(Math.scalb(21.405f, -154), Math.scalb(21.405f, -153)); 1646 assertEquals(Float.MIN_VALUE, Math.scalb(21.405f, -154)); 1647 assertEquals(-Float.MIN_VALUE, Math.scalb(-21.405f, -154)); 1648 assertEquals(posZeroBits, Float.floatToIntBits(Math 1649 .scalb(21.405f, -155))); 1650 assertEquals(negZeroBits, Float.floatToIntBits(Math.scalb(-21.405f, 1651 -155))); 1652 assertEquals(posZeroBits, Float.floatToIntBits(Math.scalb( 1653 Float.MIN_VALUE, -1))); 1654 assertEquals(negZeroBits, Float.floatToIntBits(Math.scalb( 1655 -Float.MIN_VALUE, -1))); 1656 assertEquals(Float.MIN_VALUE, Math.scalb(Float.MIN_NORMAL, -23)); 1657 assertEquals(posZeroBits, Float.floatToIntBits(Math.scalb( 1658 Float.MIN_NORMAL, -24))); 1659 assertEquals(negZeroBits, Float.floatToIntBits(Math.scalb( 1660 -Float.MIN_NORMAL, -24))); 1661 assertEquals(Float.MIN_VALUE, Math.scalb(Float.MAX_VALUE, -277)); 1662 assertEquals(posZeroBits, Float.floatToIntBits(Math.scalb( 1663 Float.MAX_VALUE, -278))); 1664 assertEquals(negZeroBits, Float.floatToIntBits(Math.scalb( 1665 -Float.MAX_VALUE, -278))); 1666 assertEquals(Float.MIN_VALUE, Math.scalb(Float.MIN_NORMAL / 3, -22)); 1667 assertEquals(posZeroBits, Float.floatToIntBits(Math.scalb( 1668 Float.MIN_NORMAL / 3, -23))); 1669 assertEquals(negZeroBits, Float.floatToIntBits(Math.scalb( 1670 -Float.MIN_NORMAL / 3, -23))); 1671 float subnormal = Math.scalb(Float.MIN_NORMAL / 3, -11); 1672 assertEquals(1.913E-42f, subnormal); 1673 // precision lost 1674 assertFalse(Float.MIN_NORMAL / 3 == Math.scalb(subnormal, 11)); 1675 1676 assertEquals(68747264, Float.floatToIntBits(Math.scalb( 1677 Float.MIN_VALUE * 153, 23))); 1678 assertEquals(-2078736384, Float.floatToIntBits(Math.scalb( 1679 -Float.MIN_VALUE * 153, 23))); 1680 1681 assertEquals(4896, Float.floatToIntBits(Math.scalb( 1682 Float.MIN_VALUE * 153, 5))); 1683 assertEquals(-2147478752, Float.floatToIntBits(Math.scalb( 1684 -Float.MIN_VALUE * 153, 5))); 1685 1686 // NaN 1687 assertTrue(Float.isNaN(Math.scalb(Float.NaN, 1))); 1688 assertTrue(Float.isNaN(Math.scalb(Float.NaN, 0))); 1689 assertTrue(Float.isNaN(Math.scalb(Float.NaN, -120))); 1690 1691 // test for exception 1692 try { 1693 Math.scalb((Float) null, (Integer) null); 1694 fail("Should throw NullPointerException"); 1695 } catch (NullPointerException e) { 1696 // Expected 1697 } 1698 try { 1699 Math.scalb(1.0f, (Integer) null); 1700 fail("Should throw NullPointerException"); 1701 } catch (NullPointerException e) { 1702 // Expected 1703 } 1704 try { 1705 Math.scalb((Float) null, 1); 1706 fail("Should throw NullPointerException"); 1707 } catch (NullPointerException e) { 1708 // Expected 1709 } 1710 1711 int b1em126 = 0x00800000; // bit representation of Float.MIN_NORMAL 1712 int b1em127 = 0x00400000; // bit representation of half 1713 // Float.MIN_NORMAL 1714 // assert exact identity 1715 assertEquals(b1em127, Float.floatToIntBits(Math.scalb(Float 1716 .intBitsToFloat(b1em126), -1))); 1717 } 1718 1719 /** 1720 * java.lang.Math#signum(double) 1721 */ 1722 public void test_signum_D() { 1723 assertTrue(Double.isNaN(Math.signum(Double.NaN))); 1724 assertTrue(Double.isNaN(Math.signum(Double.NaN))); 1725 assertEquals(Double.doubleToLongBits(0.0), Double.doubleToLongBits(Math 1726 .signum(0.0))); 1727 assertEquals(Double.doubleToLongBits(+0.0), Double 1728 .doubleToLongBits(Math.signum(+0.0))); 1729 assertEquals(Double.doubleToLongBits(-0.0), Double 1730 .doubleToLongBits(Math.signum(-0.0))); 1731 1732 assertEquals(1.0, Math.signum(253681.2187962), 0D); 1733 assertEquals(-1.0, Math.signum(-125874693.56), 0D); 1734 assertEquals(1.0, Math.signum(1.2587E-308), 0D); 1735 assertEquals(-1.0, Math.signum(-1.2587E-308), 0D); 1736 1737 assertEquals(1.0, Math.signum(Double.MAX_VALUE), 0D); 1738 assertEquals(1.0, Math.signum(Double.MIN_VALUE), 0D); 1739 assertEquals(-1.0, Math.signum(-Double.MAX_VALUE), 0D); 1740 assertEquals(-1.0, Math.signum(-Double.MIN_VALUE), 0D); 1741 assertEquals(1.0, Math.signum(Double.POSITIVE_INFINITY), 0D); 1742 assertEquals(-1.0, Math.signum(Double.NEGATIVE_INFINITY), 0D); 1743 } 1744 1745 /** 1746 * java.lang.Math#signum(float) 1747 */ 1748 public void test_signum_F() { 1749 assertTrue(Float.isNaN(Math.signum(Float.NaN))); 1750 assertEquals(Float.floatToIntBits(0.0f), Float 1751 .floatToIntBits(Math.signum(0.0f))); 1752 assertEquals(Float.floatToIntBits(+0.0f), Float 1753 .floatToIntBits(Math.signum(+0.0f))); 1754 assertEquals(Float.floatToIntBits(-0.0f), Float 1755 .floatToIntBits(Math.signum(-0.0f))); 1756 1757 assertEquals(1.0f, Math.signum(253681.2187962f), 0f); 1758 assertEquals(-1.0f, Math.signum(-125874693.56f), 0f); 1759 assertEquals(1.0f, Math.signum(1.2587E-11f), 0f); 1760 assertEquals(-1.0f, Math.signum(-1.2587E-11f), 0f); 1761 1762 assertEquals(1.0f, Math.signum(Float.MAX_VALUE), 0f); 1763 assertEquals(1.0f, Math.signum(Float.MIN_VALUE), 0f); 1764 assertEquals(-1.0f, Math.signum(-Float.MAX_VALUE), 0f); 1765 assertEquals(-1.0f, Math.signum(-Float.MIN_VALUE), 0f); 1766 assertEquals(1.0f, Math.signum(Float.POSITIVE_INFINITY), 0f); 1767 assertEquals(-1.0f, Math.signum(Float.NEGATIVE_INFINITY), 0f); 1768 } 1769 1770 /** 1771 * java.lang.Math#sin(double) 1772 */ 1773 public void test_sinD() { 1774 // Test for method double java.lang.Math.sin(double) 1775 assertEquals("Incorrect answer", 0.0, Math.sin(0), 0D); 1776 assertEquals("Incorrect answer", 0.8414709848078965, Math.sin(1), 0D); 1777 } 1778 1779 /** 1780 * java.lang.Math#sinh(double) 1781 */ 1782 public void test_sinh_D() { 1783 // Test for special situations 1784 assertTrue(Double.isNaN(Math.sinh(Double.NaN))); 1785 assertEquals(Double.POSITIVE_INFINITY, Math.sinh(Double.POSITIVE_INFINITY), 0D); 1786 assertEquals(Double.NEGATIVE_INFINITY, Math.sinh(Double.NEGATIVE_INFINITY), 0D); 1787 assertEquals(Double.doubleToLongBits(0.0), Double.doubleToLongBits(Math.sinh(0.0))); 1788 assertEquals(Double.doubleToLongBits(+0.0), Double.doubleToLongBits(Math.sinh(+0.0))); 1789 assertEquals(Double.doubleToLongBits(-0.0), Double.doubleToLongBits(Math.sinh(-0.0))); 1790 1791 assertEquals(Double.POSITIVE_INFINITY, Math.sinh(1234.56), 0D); 1792 assertEquals(Double.NEGATIVE_INFINITY, Math.sinh(-1234.56), 0D); 1793 assertEquals(1.0000000000001666E-6, Math.sinh(0.000001), 0D); 1794 assertEquals(-1.0000000000001666E-6, Math.sinh(-0.000001), 0D); 1795 assertEquals(5.115386441963859, Math.sinh(2.33482), Math.ulp(5.115386441963859)); 1796 assertEquals(Double.POSITIVE_INFINITY, Math.sinh(Double.MAX_VALUE), 0D); 1797 assertEquals(4.9E-324, Math.sinh(Double.MIN_VALUE), 0D); 1798 } 1799 1800 /** 1801 * java.lang.Math#sqrt(double) 1802 */ 1803 public void test_sqrtD() { 1804 // Test for method double java.lang.Math.sqrt(double) 1805 assertEquals("Incorrect root returned2", 7, Math.sqrt(49), 0); 1806 } 1807 1808 /** 1809 * java.lang.Math#tan(double) 1810 */ 1811 public void test_tanD() { 1812 // Test for method double java.lang.Math.tan(double) 1813 assertEquals("Incorrect answer", 0.0, Math.tan(0), 0D); 1814 assertEquals("Incorrect answer", 1.5574077246549023, Math.tan(1), 0D); 1815 1816 } 1817 1818 /** 1819 * java.lang.Math#tanh(double) 1820 */ 1821 public void test_tanh_D() { 1822 // Test for special situations 1823 assertTrue("Should return NaN", Double.isNaN(Math.tanh(Double.NaN))); 1824 assertEquals("Should return +1.0", +1.0, Math 1825 .tanh(Double.POSITIVE_INFINITY), 0D); 1826 assertEquals("Should return -1.0", -1.0, Math 1827 .tanh(Double.NEGATIVE_INFINITY), 0D); 1828 assertEquals(Double.doubleToLongBits(0.0), Double.doubleToLongBits(Math 1829 .tanh(0.0))); 1830 assertEquals(Double.doubleToLongBits(+0.0), Double 1831 .doubleToLongBits(Math.tanh(+0.0))); 1832 assertEquals(Double.doubleToLongBits(-0.0), Double 1833 .doubleToLongBits(Math.tanh(-0.0))); 1834 1835 assertEquals("Should return 1.0", 1.0, Math.tanh(1234.56), 0D); 1836 assertEquals("Should return -1.0", -1.0, Math.tanh(-1234.56), 0D); 1837 assertEquals("Should return 9.999999999996666E-7", 1838 9.999999999996666E-7, Math.tanh(0.000001), 0D); 1839 assertEquals("Should return 0.981422884124941", 0.981422884124941, Math 1840 .tanh(2.33482), 0D); 1841 assertEquals("Should return 1.0", 1.0, Math.tanh(Double.MAX_VALUE), 0D); 1842 assertEquals("Should return 4.9E-324", 4.9E-324, Math 1843 .tanh(Double.MIN_VALUE), 0D); 1844 } 1845 1846 /** 1847 * java.lang.Math#random() 1848 */ 1849 public void test_random() { 1850 // There isn't a place for these tests so just stick them here 1851 assertEquals("Wrong value E", 1852 4613303445314885481L, Double.doubleToLongBits(Math.E)); 1853 assertEquals("Wrong value PI", 1854 4614256656552045848L, Double.doubleToLongBits(Math.PI)); 1855 1856 for (int i = 500; i >= 0; i--) { 1857 double d = Math.random(); 1858 assertTrue("Generated number is out of range: " + d, d >= 0.0 1859 && d < 1.0); 1860 } 1861 } 1862 1863 /** 1864 * java.lang.Math#toRadians(double) 1865 */ 1866 public void test_toRadiansD() { 1867 for (double d = 500; d >= 0; d -= 1.0) { 1868 double converted = Math.toDegrees(Math.toRadians(d)); 1869 assertTrue("Converted number not equal to original. d = " + d, 1870 converted >= d * 0.99999999 && converted <= d * 1.00000001); 1871 } 1872 } 1873 1874 /** 1875 * java.lang.Math#toDegrees(double) 1876 */ 1877 public void test_toDegreesD() { 1878 for (double d = 500; d >= 0; d -= 1.0) { 1879 double converted = Math.toRadians(Math.toDegrees(d)); 1880 assertTrue("Converted number not equal to original. d = " + d, 1881 converted >= d * 0.99999999 && converted <= d * 1.00000001); 1882 } 1883 } 1884 1885 /** 1886 * java.lang.Math#ulp(double) 1887 */ 1888 @SuppressWarnings("boxing") 1889 public void test_ulp_D() { 1890 // Test for special cases 1891 assertTrue("Should return NaN", Double.isNaN(Math.ulp(Double.NaN))); 1892 assertEquals("Returned incorrect value", Double.POSITIVE_INFINITY, Math 1893 .ulp(Double.POSITIVE_INFINITY), 0D); 1894 assertEquals("Returned incorrect value", Double.POSITIVE_INFINITY, Math 1895 .ulp(Double.NEGATIVE_INFINITY), 0D); 1896 assertEquals("Returned incorrect value", Double.MIN_VALUE, Math 1897 .ulp(0.0), 0D); 1898 assertEquals("Returned incorrect value", Double.MIN_VALUE, Math 1899 .ulp(+0.0), 0D); 1900 assertEquals("Returned incorrect value", Double.MIN_VALUE, Math 1901 .ulp(-0.0), 0D); 1902 assertEquals("Returned incorrect value", Math.pow(2, 971), Math 1903 .ulp(Double.MAX_VALUE), 0D); 1904 assertEquals("Returned incorrect value", Math.pow(2, 971), Math 1905 .ulp(-Double.MAX_VALUE), 0D); 1906 1907 assertEquals("Returned incorrect value", Double.MIN_VALUE, Math 1908 .ulp(Double.MIN_VALUE), 0D); 1909 assertEquals("Returned incorrect value", Double.MIN_VALUE, Math 1910 .ulp(-Double.MIN_VALUE), 0D); 1911 1912 assertEquals("Returned incorrect value", 2.220446049250313E-16, Math 1913 .ulp(1.0), 0D); 1914 assertEquals("Returned incorrect value", 2.220446049250313E-16, Math 1915 .ulp(-1.0), 0D); 1916 assertEquals("Returned incorrect value", 2.2737367544323206E-13, Math 1917 .ulp(1153.0), 0D); 1918 } 1919 1920 /** 1921 * java.lang.Math#ulp(float) 1922 */ 1923 @SuppressWarnings("boxing") 1924 public void test_ulp_f() { 1925 // Test for special cases 1926 assertTrue("Should return NaN", Float.isNaN(Math.ulp(Float.NaN))); 1927 assertEquals("Returned incorrect value", Float.POSITIVE_INFINITY, Math 1928 .ulp(Float.POSITIVE_INFINITY), 0f); 1929 assertEquals("Returned incorrect value", Float.POSITIVE_INFINITY, Math 1930 .ulp(Float.NEGATIVE_INFINITY), 0f); 1931 assertEquals("Returned incorrect value", Float.MIN_VALUE, Math 1932 .ulp(0.0f), 0f); 1933 assertEquals("Returned incorrect value", Float.MIN_VALUE, Math 1934 .ulp(+0.0f), 0f); 1935 assertEquals("Returned incorrect value", Float.MIN_VALUE, Math 1936 .ulp(-0.0f), 0f); 1937 assertEquals("Returned incorrect value", 2.028241E31f, Math 1938 .ulp(Float.MAX_VALUE), 0f); 1939 assertEquals("Returned incorrect value", 2.028241E31f, Math 1940 .ulp(-Float.MAX_VALUE), 0f); 1941 1942 assertEquals("Returned incorrect value", 1.4E-45f, Math 1943 .ulp(Float.MIN_VALUE), 0f); 1944 assertEquals("Returned incorrect value", 1.4E-45f, Math 1945 .ulp(-Float.MIN_VALUE), 0f); 1946 1947 assertEquals("Returned incorrect value", 1.1920929E-7f, Math.ulp(1.0f), 1948 0f); 1949 assertEquals("Returned incorrect value", 1.1920929E-7f, 1950 Math.ulp(-1.0f), 0f); 1951 assertEquals("Returned incorrect value", 1.2207031E-4f, Math 1952 .ulp(1153.0f), 0f); 1953 assertEquals("Returned incorrect value", 5.6E-45f, Math 1954 .ulp(9.403954E-38f), 0f); 1955 } 1956 1957 /** 1958 * {@link java.lang.Math#shiftIntBits(int, int)} 1959 * @since 1.6 1960 */ 1961 public void test_shiftIntBits_II() { 1962 class Tuple { 1963 public int result; 1964 1965 public int value; 1966 1967 public int factor; 1968 1969 public Tuple(int result, int value, int factor) { 1970 this.result = result; 1971 this.value = value; 1972 this.factor = factor; 1973 } 1974 } 1975 final Tuple[] TUPLES = new Tuple[] { 1976 // sub-normal to sub-normal 1977 new Tuple(0x00000000, 0x00000001, -1), 1978 // round to even 1979 new Tuple(0x00000002, 0x00000003, -1), 1980 // round to even 1981 new Tuple(0x00000001, 0x00000005, -3), 1982 // round to infinity 1983 new Tuple(0x00000002, 0x0000000d, -3), 1984 // round to infinity 1985 1986 // normal to sub-normal 1987 new Tuple(0x00000002, 0x01a00000, -24), 1988 // round to even 1989 new Tuple(0x00000004, 0x01e00000, -24), 1990 // round to even 1991 new Tuple(0x00000003, 0x01c80000, -24), 1992 // round to infinity 1993 new Tuple(0x00000004, 0x01e80000, -24), 1994 // round to infinity 1995 }; 1996 for (int i = 0; i < TUPLES.length; ++i) { 1997 Tuple tuple = TUPLES[i]; 1998 assertEquals(tuple.result, Float.floatToIntBits(Math.scalb(Float 1999 .intBitsToFloat(tuple.value), tuple.factor))); 2000 assertEquals(tuple.result, Float.floatToIntBits(-Math.scalb(-Float 2001 .intBitsToFloat(tuple.value), tuple.factor))); 2002 } 2003 } 2004 2005 /** 2006 * {@link java.lang.Math#shiftLongBits(long, long)} 2007 * <p/> 2008 * Round result to nearest value on precision lost. 2009 * @since 1.6 2010 */ 2011 public void test_shiftLongBits_LL() { 2012 class Tuple { 2013 public long result; 2014 2015 public long value; 2016 2017 public int factor; 2018 2019 public Tuple(long result, long value, int factor) { 2020 this.result = result; 2021 this.value = value; 2022 this.factor = factor; 2023 } 2024 } 2025 final Tuple[] TUPLES = new Tuple[] { 2026 // sub-normal to sub-normal 2027 new Tuple(0x00000000L, 0x00000001L, -1), 2028 //round to even 2029 new Tuple(0x00000002L, 0x00000003L, -1), 2030 //round to even 2031 new Tuple(0x00000001L, 0x00000005L, -3), 2032 //round to infinity 2033 new Tuple(0x00000002L, 0x0000000dL, -3), 2034 //round to infinity 2035 2036 // normal to sub-normal 2037 new Tuple(0x0000000000000002L, 0x0034000000000000L, -53), // round to even 2038 new Tuple(0x0000000000000004L, 0x003c000000000000L, -53), // round to even 2039 new Tuple(0x0000000000000003L, 0x0035000000000000L, -53), // round to infinity 2040 new Tuple(0x0000000000000004L, 0x003d000000000000L, -53), // round to infinity 2041 }; 2042 for (int i = 0; i < TUPLES.length; ++i) { 2043 Tuple tuple = TUPLES[i]; 2044 assertEquals(tuple.result, Double.doubleToLongBits(Math.scalb( 2045 Double.longBitsToDouble(tuple.value), tuple.factor))); 2046 assertEquals(tuple.result, Double.doubleToLongBits(-Math.scalb( 2047 -Double.longBitsToDouble(tuple.value), tuple.factor))); 2048 } 2049 } 2050} 2051