When the warn_no_side_effect pragma is on, the compiler will issue a warning when it encounters a statement that produces no side effect. To prevent a statement with no side effects from signalling this warning, cast the statement with (void). See Listing 6.1 for an example.

#pragma warn_no_side_effect on
void foo(int a,int b)
{
   a+b; // warning: expression has no side effect
   (void)(a+b); // void cast suppresses warning
}