#include <stdlib.h>
#include <stdio.h>
#include <iostream>

using namespace std;

int main()
{
	/*************************
	 * declare the variables *
	 *************************/
	int a, b;			// int
	int e, f;			// int
	int *c = &e;			// int pointer
	int *d = &f;			// int pointer

	/*****************
	 * assign values *
	 *****************/
	a = 5;				// set a = 5
	b = 10;				// set b = 10
	*c = 15;			// set value pointed to by c = 15
	*d = 20;			// set value pointed to by d = 20

	/*************************
	 * display the variables *
	 *************************/
	cout << "a: " << a << ", b: " << b << endl;
	cout << "c: " << c << ", d: " << d << endl;
	cout << "c points to: " << *c << endl;
	cout << "d points to: " << *d << endl;
	cout << endl;

	/***********************************
	 * do stuff with the the variables *
	 ***********************************/
	c = &a;				// set c = the address of a
	d = &b;				// set d = the address of b

	/****************************************
	 * display the variables after changing *
	 ****************************************/
	cout << "a: " << a << ", b: " << b << endl;
	cout << "c: " << c << ", d: " << d << endl;
	cout << "c points to: " << *c << endl;
	cout << "d points to: " << *d << endl;
	cout << endl;

	/****************************************
	 * do more stuff with the the variables *
	 ****************************************/
	*c = 25;			// set the value pointed to by c (a) = 25
	*d = 30;			// set the value pointed to by d (b) = 30

	/*******************************
	 * display the variables again *
	 *******************************/
	cout << "a: " << a << ", b: " << b << endl;
	cout << "c: " << c << ", d: " << d << endl;
	cout << "c points to: " << *c << endl;
	cout << "d points to: " << *d << endl;
	cout << endl;

	return 0;
}