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Asked: 2026-05-15T12:39:52+00:00

I assume that abs and fabs are behaving different when using math.h . But

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I assume that abs and fabs are behaving different when using math.h. But when I use just cmath and std::abs, do I have to use std::fabs or fabs? Or isn’t this defined?

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  1. Editorial Team

    In C++, it’s always sufficient to use std::abs; it’s overloaded for all the numerical types.

    In C, abs only works on integers, and you need fabs for floating point values. These are available in C++ (along with all of the C library), but there’s no need to use them.

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