Can you compare floating point values exactly to zero?

Question

I know we can\'t compare 2 floating point values using ==. We can only compare they are within some interval of each other. I know

if(val == 0.512)
         


        

Answer 1

Even though 0 has an exact representation, you can't rely on the result of a calculation using floats to be exactly 0. As you noted, this is due to floating point calculation and conversion issues.

So, you should test for 0 against your tolerance epsilon.