// File: pointer1.cpp
//
// basic use of pointers

#include <iostream>
using namespace std;

int main() {
   int n ;                            // an int
   int *ptr ;                         // a pointer to int

   n = 3 ;
   ptr = &n ;                         // ptr has address of n

   cout << "n = " << *ptr << endl ;   // use *ptr to get n

   *ptr = 7 ;                         // changes n

   cout << "n = " << n << endl ;      // n is changed
}