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Compiler Warning (level 4) C4365

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The latest version of this topic can be found at Compiler Warning (level 4) C4365.

action' : conversion from 'type_1' to 'type_2', signed/unsigned mismatch

For example, you tried to convert an unsigned value to a signed value.

C4365 is off by default. For more information, see Compiler Warnings That Are Off by Default.

Example

The following sample generates C4365.

// C4365.cpp  
// compile with: /W4  
#pragma warning(default:4365)  
  
int f(int) { return 0; }  
void Test(size_t i) {}  
  
int main() {  
   unsigned int n = 10;  
   int o = 10;  
   n++;  
   f(n);   // C4365  
   f(o);   // OK  
  
   Test( -19 );   // C4365  
}