/* Faan Tone Liu
 * Jan 22, 2003
 * Demo program for comp 1672
 * Introduces pointers, declaring and initializing pointers, using the
 * address of operator (&) and the dereferencing operator (*)
 */
#include <iostream>
using namespace std;

int main()
{
    int i(41);
    int *ip(0);  // Good practice to ALWAYS initialize pointers to 0
                 // when you declare them
    
    // going back and forth between address and data using an int variable
    // This shows the use of the address-of operator (&)
    cout << "The value of i is     " << i << endl;
    cout << "The address of i is   " << &i << endl;

    // Using the dereferencing operator (*) to access the data stored at
    // a specific memory address.  This example is not too useful!  You
    // could just use the variable i itself, since * "undoes" &
    cout << "The value of *&i is   " << *&i << endl;

    // going back and forth between address and data
    ip = &i;
    cout << "The value of ip is    " << ip << endl;
    cout << "The data in the address ip points to is " << *ip << endl;

    // using a pointer to i to change data in i.  ip points to i, so *ip
    // refers to the same int as i does
    *ip = 51;
    cout << "The value of i is now " << i << endl;

    // cout << *i;  does not compile!

    cout << "The address of ip is  " << &ip << endl;

    return 0;
}