fdim(), fdimf(), fdiml() — Calculate the positive difference

Standards

Standards / Extensions	C or C++	Dependencies
C99 Single UNIX Specification, Version 3 C++ TR1 C99	both	z/OS® V1R5

Format

#define _ISOC99_SOURCE
#include <math.h>

double fdim(double x, double y);
float fdimf(float x, float y);
long double fdiml(long double x, long  double y);

C++ TR1 C99:

#define _TR1_C99
#include <math.h>

float fdim(float x, float y); 
long double fdim(long double x, long double y);

General description

The fdim functions compute the positive difference between x and y.

Note: The following table shows the viable formats for these functions. See IEEE binary floating-point for more information about IEEE Binary Floating-Point.

Function	Hex	IEEE
fdim	X	X
fdimf	X	X
fdiml	X	X

Restriction: The fdimf() function does not support the _FP_MODE_VARIABLE feature test macro.

Returned value

The fdim functions return the positive difference between x and y.

Related information

math.h