Is there any helper website that will invert logic/conditional statements in C?

I have if statements in C and occasionally I want to see what the opposite looks like. For example:

  if(!foo && bar)
  {
      a = 1;        
  }
  else // foo || !bar
  {
      b = 1;        
  }

I want to know when the else part will be used. Now this example is simple so it's foo || !bar right? This is why I want some sort of logic checker or inverter or helper website because I have more complicated examples and I would like to make sure the condition for the else statement is exactly what I think it is.

Thanks