1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
|
/*
Copyright (c) 1990 Regents of the University of California.
All rights reserved.
*/
/*
FUNCTION
<<labs>>---long integer absolute value
INDEX
labs
SYNOPSIS
#include <stdlib.h>
long labs(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
labs(long x)
{
if (x < 0) {
x = -x;
}
return x;
}
|
