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(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600
20       || _ISOC99_SOURCE; or cc -std=c99
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DESCRIPTION

23       The fabs() functions return the absolute value  of  the  floating-point
24       number x.
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RETURN VALUE

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

37       No errors occur.
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CONFORMING TO

40       C99, POSIX.1-2001.  The variant returning double also conforms to SVr4,
41       4.3BSD, C89.
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SEE ALSO

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

47       This  page  is  part of release 3.25 of the Linux man-pages project.  A
48       description of the project, and information about reporting  bugs,  can
49       be found at http://www.kernel.org/doc/man-pages/.
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53                                  2008-08-05                           FABS(3)
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