1 /*
2 FUNCTION
3 <<abs>>---integer absolute value (magnitude)
4 
5 INDEX
6 	abs
7 
8 ANSI_SYNOPSIS
9 	#include <stdlib.h>
10 	int abs(int <[i]>);
11 
12 TRAD_SYNOPSIS
13 	#include <stdlib.h>
14 	int abs(<[i]>)
15 	int <[i]>;
16 
17 DESCRIPTION
18 <<abs>> returns
19 @tex
20 $|x|$,
21 @end tex
22 the absolute value of <[i]> (also called the magnitude
23 of <[i]>).  That is, if <[i]> is negative, the result is the opposite
24 of <[i]>, but if <[i]> is nonnegative the result is <[i]>.
25 
26 The similar function <<labs>> uses and returns <<long>> rather than <<int>> values.
27 
28 RETURNS
29 The result is a nonnegative integer.
30 
31 PORTABILITY
32 <<abs>> is ANSI.
33 
34 No supporting OS subroutines are required.
35 */
36 
37 #include <stdlib.h>
38 
39 int
40 _DEFUN (abs, (i), int i)
41 {
42   return (i < 0) ? -i : i;
43 }
44