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():
       _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
           || /* Since glibc 2.19: */ _DEFAULT_SOURCE
           || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE

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

   For   an   explanation   of   the  terms  used  in  this  section,  see
   attributes(7).

   
   Interface                 Attribute      Value   
   
   fabs(), fabsf(), fabsl()  Thread safety  MT-Safe 
   

CONFORMING TO

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

   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

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   description  of  the project, information about reporting bugs, and the
   latest    version    of    this    page,    can     be     found     at
   https://www.kernel.org/doc/man-pages/.

                              2016-03-15                           FABS(3)

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