abs—integer absolute value (magnitude) #include <stdlib.h>
int abs(int i);
Description
abs returns
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 labs uses and returns long rather than int values.
Returns
The result is a nonnegative integer.
Portability
abs is ANSI.
No supporting OS subroutines are required.