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/*
FUNCTION
<<labs>>---long integer absolute value
 
INDEX
	labs
 
ANSI_SYNOPSIS
	#include <stdlib.h>
	long labs(long <[i]>);
 
TRAD_SYNOPSIS
	#include <stdlib.h>
	long labs(<[i]>)
	long <[i]>;
 
DESCRIPTION
<<labs>> returns
@tex
$|x|$,
@end tex
the absolute value of <[i]> (also called the magnitude
of <[i]>).  That is, if <[i]> is negative, the result is the opposite
of <[i]>, but if <[i]> is nonnegative the result is <[i]>.
 
The similar function <<abs>> uses and returns <<int>> rather than
<<long>> values.
 
RETURNS
The result is a nonnegative long integer.
 
PORTABILITY
<<labs>> is ANSI.
 
No supporting OS subroutine calls are required.
*/
 
#include <stdlib.h>
 
long
_DEFUN (labs, (x),
	long x)
{
  if (x < 0)
    {
      x = -x;
    }
  return x;
}