Header File 

stdlib.h  

Category 

Math Routines 

Prototype 

long labs(long int x); 

Description 

Gives long absolute value. 

labs computes the absolute value of the parameter x. 

Return Value 

labs returns the absolute value of x. 

Example  

#include <stdio.h>
#include <math.h>
int main(void)
{
   long result;
   long x = -12345678L;
   result= labs(x);
   printf("number: %ld abs value: %ld\n", x, result);
   return 0;
}

Portability