fdim, fdimf, fdiml - positive difference
#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
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
- An overflow floating-point exception (FE_OVERFLOW) is raised.
These functions do not set
errno.
These functions first appeared in glibc in version 2.1.
For an explanation of the terms used in this section, see
attributes(7).
| Interface |
Attribute |
Value |
| fdim (), fdimf (), fdiml () |
Thread safety |
MT-Safe |
C99, POSIX.1-2001, POSIX.1-2008.
fmax(3)