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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():
           _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
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
       For  an  explanation  of  the  terms  used   in   this   section,   see
       attributes(7).
       +-------------------------+---------------+---------+
       |Interface                | Attribute     | Value   |
       +-------------------------+---------------+---------+
       |fdim(), fdimf(), fdiml() | Thread safety | MT-Safe |
       +-------------------------+---------------+---------+
CONFORMING TO
       C99, POSIX.1-2001, POSIX.1-2008.
SEE ALSO
       fmax(3)
COLOPHON
       This  page  is  part of release 4.15 of the Linux man-pages project.  A
       description of the project, information about reporting bugs,  and  the
       latest     version     of     this    page,    can    be    found    at
       https://www.kernel.org/doc/man-pages/.
                                  2017-09-15                           FDIM(3)