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.
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For an explanation of the terms used in this section, see attributes(7). |
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.
fmax(3)