Program not entering if statement

Question

In my python program, an if statement is not being entered. I have simplified the code to the following:

x = -5
while x < 5:
    if (x == 0):
        prin         


        

Answer 1

In binary, .01 has no exact representation but .5 does.

It's the same problem you'd have in decimal if you represented 1/3 as .333333 and kept adding 1/3 until you reached 1. After three additions, you'd have .999999 which is not exactly equal to 1.

Don't compare non-integers for equality unless you precisely understand the rules for doing so and are 100% sure your case is one of the ones that will work.