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

NAME
       fabs, fabsf, fabsl - absolute value of floating-point number
SYNOPSIS
       #include <math.h>
       double fabs(double x);
       float fabsf(float x);
       long double fabsl(long double x);
       Link with -lm.
   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
       fabsf(), fabsl():
           _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 ||
           _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L;
           or cc -std=c99
DESCRIPTION
       These functions return the absolute value of the floating-point  number
       x.
RETURN VALUE
       These functions return the absolute value of x.
       If x is a NaN, a NaN is returned.
       If x is -0, +0 is returned.
       If  x  is  negative infinity or positive infinity, positive infinity is
       returned.
ERRORS
       No errors occur.
ATTRIBUTES
   Multithreading (see pthreads(7))
       The fabs(), fabsf(), and fabsl() functions are thread-safe.
CONFORMING TO
       C99, POSIX.1-2001.  The variant returning double also conforms to SVr4,
       4.3BSD, C89.
SEE ALSO
       abs(3), cabs(3), ceil(3), floor(3), labs(3), rint(3)
COLOPHON
       This  page  is  part of release 3.53 of the Linux man-pages project.  A
       description of the project, and information about reporting  bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.

                                  2013-07-10                           FABS(3)