fabsf(3) - f30

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 versions <= 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
43       attributes(7).
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45       ┌─────────────────────────┬───────────────┬─────────┐
46       │Interface                │ Attribute     │ Value   │
47       ├─────────────────────────┼───────────────┼─────────┤
48       │fabs(), fabsf(), fabsl() │ Thread safety │ MT-Safe │
49       └─────────────────────────┴───────────────┴─────────┘

CONFORMING TO

51       C99, POSIX.1-2001, POSIX.1-2008.
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53       The variant returning double also conforms to SVr4, 4.3BSD, C89.
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COLOPHON

59       This page is part of release 4.16 of the Linux  man-pages  project.   A
60       description  of  the project, information about reporting bugs, and the
61       latest    version    of    this    page,    can     be     found     at
62       https://www.kernel.org/doc/man-pages/.
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66                                  2017-09-15                           FABS(3)