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並前往https://stackoverflow.com/questions/3118165/when-do-i-use-fabs-and-when-is-it-sufficient-to-use-stdabs

When do I use fabs and when is it sufficient to use std::abs?

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 ...

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