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

NAME

       abs, labs, llabs, imaxabs - compute the absolute value of an integer

SYNOPSIS

       #include <stdlib.h>

       int abs(int j);
       long int labs(long int j);
       long long int llabs(long long int j);

       #include <inttypes.h>

       intmax_t imaxabs(intmax_t j);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       llabs():
	   _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L;
	   or cc -std=c99

DESCRIPTION

       The abs() function computes the absolute value of the integer argument j.  The labs(), llabs() and imaxabs() functions compute the absolute
       value of the argument j of the appropriate integer type for the function.

RETURN VALUE

       Returns the absolute value of the integer argument, of the appropriate integer type for the function.

CONFORMING TO

       SVr4, POSIX.1-2001, 4.3BSD, C99.  C89 only includes the abs() and labs() functions; the functions llabs() and imaxabs() were added in C99.

NOTES

       Trying to take the absolute value of the most negative integer is not defined.

       The llabs() function is included in glibc since version 2.0, but is not in libc5 or libc4.  The imaxabs() function  is  included  in  glibc
       since version 2.1.1.

       For  llabs()  to  be  declared,	it  may be necessary to define _ISOC99_SOURCE or _ISOC9X_SOURCE (depending on the version of glibc) before
       including any standard headers.

       GCC handles abs() and labs() as built-in functions.  GCC 3.0 also handles llabs() and imaxabs() as built-ins.

SEE ALSO

       cabs(3), ceil(3), fabs(3), floor(3), rint(3)

COLOPHON

       This page is part of release 3.27 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/.

GNU
								    2010-09-20								    ABS(3)