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

6       fabs, fabsf, fabsl - absolute value of floating-point number
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SYNOPSIS

9       #include <math.h>
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11       double fabs(double x);
12       float fabsf(float x);
13       long double fabsl(long double x);
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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       fabsf(), fabsl():
20           _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
21               || /* Since glibc 2.19: */ _DEFAULT_SOURCE
22               || /* Glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
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DESCRIPTION

25       These  functions return the absolute value of the floating-point number
26       x.
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RETURN VALUE

29       These functions return the absolute value of x.
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31       If x is a NaN, a NaN is returned.
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33       If x is -0, +0 is returned.
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35       If x is negative infinity or positive infinity,  positive  infinity  is
36       returned.
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ERRORS

39       No errors occur.
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ATTRIBUTES

42       For  an  explanation  of  the  terms  used  in  this  section,  see at‐
43       tributes(7).
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45       ┌────────────────────────────────────────────┬───────────────┬─────────┐
46       │Interface                                   │ Attribute     │ Value   │
47       ├────────────────────────────────────────────┼───────────────┼─────────┤
48       │fabs(), fabsf(), fabsl()                    │ Thread safety │ MT-Safe │
49       └────────────────────────────────────────────┴───────────────┴─────────┘
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CONFORMING TO

52       C99, POSIX.1-2001, POSIX.1-2008.
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54       The variant returning double also conforms to SVr4, 4.3BSD, C89.
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SEE ALSO

57       abs(3), cabs(3), ceil(3), floor(3), labs(3), rint(3)
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COLOPHON

60       This page is part of release 5.12 of the Linux  man-pages  project.   A
61       description  of  the project, information about reporting bugs, and the
62       latest    version    of    this    page,    can     be     found     at
63       https://www.kernel.org/doc/man-pages/.
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67                                  2021-03-22                           FABS(3)
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