1 // RUN: %clang_cc1 -fsyntax-only -Wliteral-conversion -verify %s
2 
3 void foo(int y);
4 
5 // Warn when a literal float or double is assigned or bound to an integer.
6 void test0() {
7   // Float
8   int y0 = 1.2222F; // expected-warning {{implicit conversion from 'float' to 'int' changes value from 1.2222 to 1}}
9   int y1 = (1.2222F); // expected-warning {{implicit conversion from 'float' to 'int' changes value from 1.2222 to 1}}
10   int y2 = (((1.2222F))); // expected-warning {{implicit conversion from 'float' to 'int' changes value from 1.2222 to 1}}
11   int y3 = 12E-1F; // expected-warning {{implicit conversion from 'float' to 'int' changes value from 1.2 to 1}}
12   int y4 = 1.23E1F; // expected-warning {{implicit conversion from 'float' to 'int' changes value from 12.3 to 12}}
13   // Double
14   int y5 = 1.2222; // expected-warning {{implicit conversion from 'double' to 'int' changes value from 1.2222 to 1}}
15   int y6 = 12E-1; // expected-warning {{implicit conversion from 'double' to 'int' changes value from 1.2 to 1}}
16   int y7 = 1.23E1; // expected-warning {{implicit conversion from 'double' to 'int' changes value from 12.3 to 12}}
17   int y8 = (1.23E1); // expected-warning {{implicit conversion from 'double' to 'int' changes value from 12.3 to 12}}
18 
19   // Test assignment to an existing variable.
20   y8 = 2.22F; // expected-warning {{implicit conversion from 'float' to 'int' changes value from 2.22 to 2}}
21 
22   // Test direct initialization.
23   int y9(1.23F); // expected-warning {{implicit conversion from 'float' to 'int' changes value from 1.23 to 1}}
24 
25   // Test passing a literal floating-point value to a function that takes an integer.
26   foo(1.2F); // expected-warning {{implicit conversion from 'float' to 'int' changes value from 1.2 to 1}}
27 
28   int y10 = -1.2F;  // expected-warning {{implicit conversion from 'float' to 'int' changes value from -1.2 to -1}}
29 
30   // -Wliteral-conversion 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 
42 // Similarly, test floating point conversion to bool. Only float values of zero
43 // are converted to false; everything else is converted to true.
44 void test1() {
45   bool b1 = 0.99f; // expected-warning {{implicit conversion from 'float' to 'bool' changes value from 0.99 to true}}
46   bool b2 = 0.99; // expected-warning {{implicit conversion from 'double' to 'bool' changes value from 0.99 to true}}
47   // These do not warn because they can be directly converted to integral
48   // values.
49   bool b3 = 0.0f;
50   bool b4 = 0.0;
51 }
52