#include <stdio.h>

int main() {
    // two integers.
    int a = 10, b = 20;

    // two pointers, pointing to 'a' and 'b'
    int *p = &a, *q = &b;

    // print the difference between the pointers
    printf("Difference between p and q is %d\n", p - q);

    return 0;
}