FDIM(3) Linux Programmer s Manual FDIM(3)
NAME 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(): _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE; or cc -std=c99
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 An overflow floating-point exception (FE_OVERFLOW) is raised.
These functions do not set errno.
VERSIONS These functions first appeared in glibc in version 2.1.
CONFORMING TO C99, POSIX.1-2001.
SEE ALSO fmax(3)
COLOPHON This page is part of release 3.22 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.