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by metadat
299 days ago
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For anyone else who forgot this or is unfamiliar with why / how it "works": > #define isNan(X) ((X) != (X)) > Works by exploiting a unique property of NaN (Not a Number) values in the IEEE-754 floating point standard: a NaN is not equal to itself. In other words, if you compare a floating-point variable to itself and the result is false ((X) != (X)(X)!=(X)), then X X is NaN. Fantastic example, thank you @spyrja! |
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