fabs, fabsf, fabsl - absolute value of floating-point num
ber
#include <math.h>
double fabs(double x);
float fabsf(float x);
long double fabsl(long double x);
The fabs functions return the absolute value of the float
ing-point number x.
No errors can occur.
The fabs() function conforms to SVID 3, POSIX, BSD 4.3,
ISO 9899. The other functions are from C99.
abs(3), ceil(3), floor(3), labs(3), rint(3)