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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
       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 builtin functions.  GCC 3.0  also  han‐
       dles llabs() and imaxabs() as builtins.

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

GNU				  2000-12-17				ABS(3)
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