FDIM(3) BSD Library Functions Manual FDIM(3)NAME
fdim -- return difference if positive, 0 otherwise
SYNOPSIS
#include <math.h>
double
fdim(double x, double y);
long double
fdiml(long double x, long double y);
float
fdimf(float x, float y);
DESCRIPTION
The fdim() functions return the "positive difference" between their arguments: x - y if x > y, +0 if x is less than or equal to y.
SEE ALSO fma(3), fmax(3), fmin(3)STANDARDS
The fdim() functions conform to ISO/IEC 9899:2011.
BSD December 11, 2006 BSD
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FDIM(3) Linux Programmer's Manual FDIM(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);
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.
ATTRIBUTES
Multithreading (see pthreads(7))
The fdim(), fdimf(), and fdiml() functions are thread-safe.
CONFORMING TO
C99, POSIX.1-2001.
SEE ALSO fmax(3)COLOPHON
This page is part of release 3.53 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
2013-07-15 FDIM(3)
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