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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 ||
           _POSIX_C_SOURCE >= 200112L;
           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.
ATTRIBUTES
   Multithreading (see pthreads(7))
       The fdim(), fdimf(), and fdiml() functions are thread-safe.
CONFORMING TO
       C99, POSIX.1-2001.
SEE ALSO
       fmax(3)
COLOPHON
       This  page  is  part of release 3.53 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/.

                                  2013-07-15                           FDIM(3)