>It's ridiculous anyway. In any type of math, division by zero is not supposed to be 'infinity', it's supposed to be 'undefined'. But you're right, infinity should be outside the range of double and float, but they have special values of positive infinity and negative infinity. I have no good idea why. 5/0 gives positive infinity. -5/0 gives negative infinity.

http://en.wikipedia.org/wiki/Divide_by_zero