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2.22 llabs—compute the absolute value of an long long integer.

Synopsis 

     #include <stdlib.h>
     long long llabs(long long j);

Description
The llabs function computes the absolute value of the long long integer argument j (also called the magnitude of j).

The similar function labs uses and returns long rather than long long values.
Returns
A nonnegative long long integer.
Portability
llabs is ISO 9899 (C99) compatable.

No supporting OS subroutines are required.