warn-literal-conversion.cpp revision 9ce6377714a8eb8f577c87028300421e72b00dc9 
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 = 12E-1F; // expected-warning {{implicit conversion turns literal floating-point number into integer}}
12  int y4 = 1.23E1F; // 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 = 12E-1; // expected-warning {{implicit conversion turns literal floating-point number into integer}}
16  int y7 = 1.23E1; // expected-warning {{implicit conversion turns literal floating-point number into integer}}
17  int y8 = (1.23E1); // 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  int y10 = -1.2F;  // expected-warning {{implicit conversion turns literal floating-point number into integer}}
29
30  // -Wconversion-literal does NOT catch const values.
31  // (-Wconversion DOES catch them.)
32  static const float sales_tax_rate = .095F;
33  int z = sales_tax_rate;
34  foo(sales_tax_rate);
35
36  // Expressions, such as those that indicate rounding-down, should NOT produce warnings.
37  int x = 24 * 0.5;
38  int y = (24*60*60) * 0.25;
39  int pennies = 123.45 * 100;
40}
41