fdim, fdimf, fdiml - compute positive difference

Definition	#include <math.h> double fdim(double x, double y); (C11) float fdimf(float x, float y); (C11) long double fdiml(long double x, long double y); (C11) These functions compute the positive difference between the floating-point numbers x and y.
Return val.	x - y                   if x > y 0                        if x <= y HUGE_VAL/HUGE_VALF/HUGE_VALL                           depending on the function type, if an overflow occurs.                           errno is set to ERANGE.
See also	fmax, fmin