warn-literal-conversion.cpp revision a5b9332418f25338f118358e27303cd510d54107
1// RUN: %clang_cc1 -fsyntax-only -Wliteral-conversion -verify %s 2 3void foo(int y); 4 5// Warn when a literal float or double is assigned or bound to an integer. 6void test0() { 7 // Float 8 int y0 = 1.2222F; // expected-warning {{implicit conversion turns literal floating-point number into integer}} 9 int y1 = (1.2222F); // expected-warning {{implicit conversion turns literal floating-point number into integer}} 10 int y2 = (((1.2222F))); // expected-warning {{implicit conversion turns literal floating-point number into integer}} 11 int y3 = 12E1F; // expected-warning {{implicit conversion turns literal floating-point number into integer}} 12 int y4 = 1.2E1F; // expected-warning {{implicit conversion turns literal floating-point number into integer}} 13 // Double 14 int y5 = 1.2222; // expected-warning {{implicit conversion turns literal floating-point number into integer}} 15 int y6 = 12E1; // expected-warning {{implicit conversion turns literal floating-point number into integer}} 16 int y7 = 1.2E1; // expected-warning {{implicit conversion turns literal floating-point number into integer}} 17 int y8 = (1.2E1); // expected-warning {{implicit conversion turns literal floating-point number into integer}} 18 19 // Test assignment to an existing variable. 20 y8 = 2.22F; // expected-warning {{implicit conversion turns literal floating-point number into integer}} 21 22 // Test direct initialization. 23 int y9(1.23F); // expected-warning {{implicit conversion turns literal floating-point number into integer}} 24 25 // Test passing a literal floating-point value to a function that takes an integer. 26 foo(1.2F); // expected-warning {{implicit conversion turns literal floating-point number into integer}} 27 28 // FIXME: -Wconversion-literal doesn't catch "-1.2F". 29 int y10 = -1.2F; 30 31 // -Wconversion-literal does NOT catch const values. 32 // (-Wconversion DOES catch them.) 33 static const float sales_tax_rate = .095F; 34 int z = sales_tax_rate; 35 foo(sales_tax_rate); 36 37 // Expressions, such as those that indicate rounding-down, should NOT produce warnings. 38 int x = 24 * 0.5; 39 int y = (24*60*60) * 0.25; 40 int pennies = 123.45 * 100; 41} 42