Floating point representations seem to do integer arithmetic correctly - why?

Question

I\'ve been playing around with floating point numbers a little bit, and based on what I\'ve learned about them in the past, the fact that 0.1 + 0.2 ends up bein

Answer 1

All floating point numbers can't be represented. it's due to the way of coding them. The wiki page explain it better than me: http://en.wikipedia.org/wiki/IEEE_754-1985. So when you are trying to compare a floating point number, you should use a delta:

myFloat - expectedFloat < delta

You can use the smallest representable floating point number as delta.