1FDIM(3)                    Linux Programmer's Manual                   FDIM(3)
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NAME

6       fdim, fdimf, fdiml - positive difference
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SYNOPSIS

9       #include <math.h>
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11       double fdim(double x, double y);
12       float fdimf(float x, float y);
13       long double fdiml(long double x, long double y);
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15       Link with -lm.
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17   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
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19       fdimf(), fdiml():
20           _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE ||
21           _POSIX_C_SOURCE >= 200112L;
22           or cc -std=c99
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DESCRIPTION

25       These functions return the  positive  difference,  max(x-y,0),  between
26       their arguments.
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RETURN VALUE

29       On success, these functions return the positive difference.
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31       If x or y is a NaN, a NaN is returned.
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33       If the result overflows, a range error occurs, and the functions return
34       HUGE_VAL, HUGE_VALF, or HUGE_VALL, respectively.
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ERRORS

37       See math_error(7) for information on how to determine whether an  error
38       has occurred when calling these functions.
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40       The following errors can occur:
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42       Range error: result overflow
43              An overflow floating-point exception (FE_OVERFLOW) is raised.
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45       These functions do not set errno.
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VERSIONS

48       These functions first appeared in glibc in version 2.1.
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ATTRIBUTES

51   Multithreading (see pthreads(7))
52       The fdim(), fdimf(), and fdiml() functions are thread-safe.
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CONFORMING TO

55       C99, POSIX.1-2001.
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SEE ALSO

58       fmax(3)
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COLOPHON

61       This  page  is  part of release 3.53 of the Linux man-pages project.  A
62       description of the project, and information about reporting  bugs,  can
63       be found at http://www.kernel.org/doc/man-pages/.
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67                                  2013-07-15                           FDIM(3)