1.20 fdim, fdimf—positive difference

Synopsis

#include <math.h>
double fdim(double x, double y);
float fdimf(float x, float y);

Description
The fdim functions determine the positive difference between their arguments, returning:

	x - y	if x > y, or

	+0	if x <= y, or

	NAN	if either argument is NAN.

A range error may occur.

Returns
The fdim functions return the positive difference value.

Portability
ANSI C, POSIX.