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/.

2008-08-11 FDIM(3)