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ABS(3) Library Functions Manual ABS(3)

abs
integer absolute value function

#include <stdlib.h>
int
abs(int j);

The abs() function computes the absolute value of the integer j.

The abs() function returns the absolute value.

cabs(3), floor(3), hypot(3), imaxabs(3), labs(3)

The abs() function conforms to ANSI X3.159-1989 (“ANSI C89”).

The abs() function first appeared in Version 6 AT&T UNIX.

The absolute value of the most negative integer remains negative.
July 17, 2013 OpenBSD-5.6