#include <stdio.h>
int sum_and_diff (int a, int b, int *res)
{
	int sum;
	sum = a + b;
	*res = a – b;
	return sum;
}
void main (void)
{
	int b = 2;
	int diff;
	printf ("The sum of 5 and %d is %d\n", b,
	sum_and_diff (5, b, &diff));
	printf ("The difference of 5 and %d is %d\n", b, diff);
}

##</code><code>##

SCALAR(0x60008a730) --> reference to a scalar
ARRAY(0x60008a828)  --> reference to an array
REF(0x600003e80)    --> reference to a reference

##</code><code>##

$$x  # dereference reference to scalar (if $x is a scalar)
@$x  # dereference reference to array (if $x is reference to an array)
@$$x # dereference reference to reference of an array