Is checking a double for equality ever safe?

Question

I have the following code:

double x = 0;

{ ...do stuff ...}

if(x == 0){

}

I was always taught that you shouldn\'t check floats for equal

Answer 1

It is safe if the 0 you're trying to catch is the original 0 set at initialization. However, it isn't safe if you're expecting a 0 from a mathematical operation.