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
