std::fabs is an STL function to take the absolute value of a double.

std::fabs is defined in the header file cmath.h.


#include <cassert>

#include <cmath>



int main()

{

  const double x = 3.14;

  const double y = -x;

  assert(x == std::fabs(y));

}

Difference between std::abs and std::fabs

std::abs can be used to calculate the absolute value of both an integer and a double, where std::fabs can only be used to obtain the absolute value of a double.

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(C++) std::fabs

Difference between std::abs and std::fabs