// Self-Test 1#include <iostream>using namespace std;int main(){   int *p = new int;   int *q = new int;   cout << p << " " << q << endl;   *p = 7;   *q = 11;   int *r = q;   cout << *p << " " << *q << " " << *r << endl;   *r = *q + *p;   cout << *p << " " << *q << " " << *r << endl;   q = new int;   *q = 4;   cout << *p << " " << *q << " " << *r << endl;   delete r;   r = NULL;   return 0;}  // end main