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

Use the tolerance / ephsilon approach.

I just evaluated the following in Java, which mathematically results in zero:

1.0/5.0 + 1.0/5.0 - 1.0/10.0 - 1.0/10.0 - 1.0/10.0 - 1.0/10.0

and actually got

2.7755575615628914E-17