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Due to rounding errors, most floating-point numbers end up being slightly imprecise. As long as this imprecision stays small, it can usually be ignored. However, it also means that numbers expected to be equal (e.g. when calculating the same result through different correct methods) often differ slightly, and a simple equality test fails. For example: float a = 0.15 + 0.15 float b = 0.1 + 0.2 if(a
What Every Programmer Should Know About Floating-Point Arithmetic or Why don’t my numbers add up? So you’ve written some absurdly simple code, say for example: 0.1 + 0.2 and got a really unexpected result: 0.30000000000000004 Maybe you asked for help on some forum and got pointed to a long article with lots of formulas that didn’t seem to help with your problem. Well, this site is here to: Explain
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