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LETTERabsULETTER Returns the absolute value of an integer.

Overview
#include <stdlib.h>

r = abs(i);

int r; // result
int i; // integer

Portability
ANSI

Description
"abs" returns the absolute value of the argument passed it and operates similar to "(i >=0 ? +i : -1)". The function can also be used as a macro:
#define abs(x) ((x)<0?-(x):(x))

Returns
The absolute value of its argument.

See also
fabs , labs