fdim(3) Linux Man Page - System Grab Bag

Name

fdim, fdimf, fdiml - positive difference

Math library ( libm ", " -lm )

#include <math.h> 
double fdim(double " x ", double  y );
float fdimf(float " x ", float  y );
long double fdiml(long double " x ", long double  y );

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

fdimf() fdiml()

    _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L

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

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.

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 errno is set to ERANGE .An overflow floating-point exception ( FE_OVERFLOW ) is raised.

For an explanation of the terms used in this section, see attributes(7). allbox; lbx lb lb T{ fdim()fdimf()fdiml()

Interface	Attribute	Value
T}	Thread safety	MT-Safe

glibc 2.1. C99, POSIX.1-2001.

Before glibc 2.24 on certain architectures (e.g., x86, but not x86_64) these functions did not set errno.