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           _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
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DESCRIPTION

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

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

35       See  math_error(7) for information on how to determine whether an error
36       has occurred when calling these functions.
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38       The following errors can occur:
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40       Range error: result overflow
41              errno is set to ERANGE.  An  overflow  floating-point  exception
42              (FE_OVERFLOW) is raised.
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VERSIONS

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

48       For  an  explanation  of  the  terms  used  in  this  section,  see at‐
49       tributes(7).
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51       ┌─────────────────────────┬───────────────┬─────────┐
52       │Interface                │ Attribute     │ Value   │
53       ├─────────────────────────┼───────────────┼─────────┤
54       │fdim(), fdimf(), fdiml() │ Thread safety │ MT-Safe │
55       └─────────────────────────┴───────────────┴─────────┘

CONFORMING TO

57       C99, POSIX.1-2001, POSIX.1-2008.
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BUGS

60       Before glibc version 2.24 on certain architectures (e.g., x86, but  not
61       x86_64) these functions did not set errno.
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SEE ALSO

64       fmax(3)
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COLOPHON

67       This  page  is  part of release 5.10 of the Linux man-pages project.  A
68       description of the project, information about reporting bugs,  and  the
69       latest     version     of     this    page,    can    be    found    at
70       https://www.kernel.org/doc/man-pages/.
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74                                  2020-06-09                           FDIM(3)
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