fdim man page

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);

Link with -lm.

Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

fdimf(), fdiml():

_ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L

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).

InterfaceAttributeValue
fdim(), fdimf(), fdiml()Thread safetyMT-Safe

Conforming to

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

See Also

fmax(3)

Colophon

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Referenced By

fmax(3), fmin(3).

fdimf(3) and fdiml(3) are aliases of fdim(3).

2016-03-15 Linux Programmer's Manual