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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);

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 func-
       tion.

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

CONFORMING TO
       SVID  3,	 POSIX.1, BSD 4.3, ISO/IEC 9899	(C99).	POSIX.1	(1996 edition)
       only  requires  the  abs()  function.   ISO/IEC	9899:1990  (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 builtin functions.  GCC 3.0 also han-
       dles llabs() and	imaxabs() as builtins.

SEE ALSO
       ceil(3),	floor(3), fabs(3), rint(3)

GNU				  2000-12-17				ABS(3)

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | CONFORMING TO | NOTES | SEE ALSO

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