Man page - fdimf(3)

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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).

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C11, POSIX.1-2008.

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 .