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FDIM

Section: Linux Programmer's Manual (3)
Updated: 2010-09-20
Index Return to Main Contents

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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);

Link with -lm.

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

fdimf(), fdiml():

_XOPEN_SOURCE >= 600 || _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L;
or cc -std=c99

 

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.  

CONFORMING TO

C99, POSIX.1-2001.  

SEE ALSO

fmax(3)  

COLOPHON

This page is part of release 3.35 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://man7.org/linux/man-pages/.

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Index

NAME

SYNOPSIS

DESCRIPTION

RETURN VALUE

ERRORS

VERSIONS

CONFORMING TO

SEE ALSO

COLOPHON

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