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

You still shouldn't check to see if it's equal to zero. Just check to see if it's near zero.

private final static double EPSILON = 0.00001;
if (x + EPSILON > 0 && x - EPSILON < 0){
...
}