C# float bug? 0.1 - 0.1 = 1.490116E-08

Question

What\'s going on?! Subtraction works fine until I get to 0.1 - 0.1. I\'m in visual c# 2008 using the nonoba.com API.

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Answer 1

Floating point math is always approximate, in any language, because that's how CPUs work. If you care about the absolute precision of your answers - for example, because you're dealing with money - then you shouldn't use floating point.