fabs(3) [freebsd man page]

FABS(3) 						   BSD Library Functions Manual 						   FABS(3)

NAME

     fabs, fabsf, fabsl -- floating-point absolute value functions

LIBRARY

     Math Library (libm, -lm)

SYNOPSIS

     #include <math.h>

     double
     fabs(double x);

     float
     fabsf(float x);

     long double
     fabsl(long double x);

DESCRIPTION

     The fabs(), fabsf() and fabsl() functions compute the absolute value of a floating-point number x.

RETURN VALUES

     The fabs(), fabsf() and fabsl() functions return the absolute value of x.

SEE ALSO

     abs(3), ceil(3), floor(3), ieee(3), math(3), rint(3)

STANDARDS

     The fabs() function conforms to ISO/IEC 9899:1990 (``ISO C90'').  The fabsf() and fabsl() functions conform to ISO/IEC 9899:1999
     (``ISO C99'').

BSD
								 October 25, 2003							       BSD

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)