Simultaneous execution of both if and else blocks

Question

In C or C++

if ( x )
    statement1;
else
    statement2;

For what value of x will both statements be executed?

I know

Answer 1

If it is a trick question, you could answer with

if( ({ statement2; 1; }) ) 
  statement1;
else
  statement2;

Using GCC statement expressions :) For expression statements, there is the comma operator

if(expr2, 1) 
  expr1;
else
  expr2;

This is a quite popular question.