fdimf (3) Linux Manual Page
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():
- _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
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
- errno is set to ERANGE. An overflow floating-point exception (FE_OVERFLOW) is raised.
Versions
These functions first appeared in glibc in version 2.1.Attributes
For an explanation of the terms used in this section, see attributes(7).| Interface | Attribute | Value |
| fdim(), fdimf(), fdiml() | Thread safety | MT-Safe |