labs---long integer absolute value
#include <stdlib.h> long labs(long i);
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
The result is a nonnegative long integer.
labs is ANSI.
No supporting OS subroutine calls are required.
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