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Compiler Warning (level 1) C4548 

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Error Message

expression before comma has no effect; expected expression with side-effect

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 C4548:

// C4548.cpp
// compile with: /W1
#pragma warning (default : 4548)
int main()
{
   int i = 0, k = 0;

   if ( i, k )   // C4548
   // try the following line instead
   // if ( i = 0, k )
      i++;
}