Edit

Share via

Compiler Error C2180

  • Article

controlling expression has type 'type'

The controlling expression in an if, while, for, or do statement is an expression cast to void. To fix this issue, change the controlling expression to one that produces a bool or a type that can be converted to bool.

The following sample generates C2180:

// C2180.c

int main() {
   while ((void)1)   // C2180
      return 1;
   while (1)         // OK
      return 0;
}