abs is only implemented for integer in C. That's why the answers are all recommending you use fabs, which is the floating-point equivalent. ... <看更多>

namespace std { float abs(float x); // (1) double abs(double x); // (2) ... double abs(Integral x); // (4) C++11 から C++14 まで int abs(int ... ... <看更多>

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The standard C++ and C implementations of abs() indeed don't work with float. However, Arduino has replaced that with their own macro ... ... <看更多>