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Compiler Warning (level 1) C4549 

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Error Message

'operator' : operator before comma has no effect; did you intend 'operator'?

The compiler detected an ill-formed comma expression.

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

The following sample generates C4549:

// C4549.cpp
// compile with: /W1
#pragma warning (default : 4549)

int main() {
   int i = 0, k = 0;

   if ( i == 0, k )   // C4549
   // try the following line instead
   // if ( i == 0 )
      i++;
}