fdim(3) — Linux manual pages

Linux manual pages	Section 3

Name

fdim, fdimf, fdiml — positive difference

Synopsis

#include <math.h>

`double fdim(`	double `x`,
	double `y)`;

`float fdimf(`	float `x`,
	float `y)`;

`long double fdiml(`	long double `x`,
	long double `y)`;

Note

Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
`fdimf`(), `fdiml`():
`_ISOC99_SOURCE` \|\| `_POSIX_C_SOURCE` >= 200112L

	Note
	Link with `−lm`.

DESCRIPTION

These functions return the positive difference, max(x-y,0), between their arguments.

RETURN VALUE

On success, these functions return the positive difference.

If x or y is a NaN, a NaN is returned.

If the result overflows, a range error occurs, and the functions return HUGE_VAL, HUGE_VALF, or HUGE_VALL, respectively.

ERRORS

See math_error(7) for information on how to determine whether an error has occurred when calling these functions.

The following errors can occur:

Range error: result overflow: An overflow floating-point exception (FE_OVERFLOW) is raised.

These functions do not set errno.

VERSIONS

These functions first appeared in glibc in version 2.1.

ATTRIBUTES

For an explanation of the terms used in this section, see attributes(7).

Interface	Attribute	Value
`fdim`(), `fdimf`(), `fdiml`()	Thread safety	MT-Safe

CONFORMING TO

C99, POSIX.1-2001, POSIX.1-2008.

COLOPHON

This page is part of release 4.07 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man−pages/.

Copyright 2003 Walter Harms, Andries Brouwer
and Copyright 2008, Linux Foundation, written by Michael Kerrisk
<mtk.manpagesgmail.com>

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