// Pantea Aria

// playing with pointers


#include <stdio.h>

int main(void) {
    int a = 5;
    int b = 10;

    int *p = &a;
    int *q = &b;

    printf("Before:\n");
    printf("a = %d, b = %d\n", a, b);

    // what is happening here?
    // let's draw diagrams
    *p = *p + *q;   
    *q = *p - *q;   
    *p = *p - *q;   

    printf("After:\n");
    printf("a = %d, b = %d\n", a, b);    //what will we see???

    return 0;
}