// This program demonstrates a pointer variable referencing
// different variables.
#include <iostream>
using namespace std;

int main()
{
   int x = 25, y = 50, z = 75;  // Three int variables
   int *ptr;                    // Pointer variable

   // Display the contents of x, y, and z.
   cout << "Here are the values of x, y, and z:\n";
   cout << x << " " << y << " " << z << endl;

   // Use the pointer to manipulate x, y, and z.

   ptr = &x;      // Store the address of x in ptr.
   *ptr += 100;   // Add 100 to the value in x.

   ptr = &y;      // Store the address of y in ptr.
   *ptr += 100;   // Add 100 to the value in y.

   ptr = &z;      // Store the address of z in ptr.
   *ptr += 100;   // Add 100 to the value in z.

   // Display the contents of x, y, and z.
   cout << "Once again, here are the values of x, y, and z:\n";
   cout << x << " " << y << " " << z << endl;
   return 0;
}