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return the absolute value of a long integer

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#include <stdlib.h>
long labs ( long j )

The labs function returns the absolute value of the long integer j, denoted by $|j|$ and defined through:

$|j| := \left\{ \begin{array}{ll} j, & j \geq 0, \\ -j, & j < 0. \end{array} \right.$

(1)

#include <stdio.h>
#include <stdlib.h>

int main()
{
  long int a = -231564565;
  printf("|a| = %ld\n", labs(a));
  return 0;
}

Output:

|a| = 231564565

The absolute value of the most negative integer remains negative.

labs