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      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