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.


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/.

2008-08-11 FDIM(3)