swaps.cpp

// swaps.cpp -- swapping with references and with pointers
#include <iostream>
void swapr(int & a, int & b);		// a, b are aliases for ints
void swapp(int * p, int * q);		// p, q are addresses of ints
void swapv(int a, int b);			// a, b are new variables

int main()
{
	using namespace std;
	int wallet1 = 300;
	int wallet2 = 350;

	cout << "wallet1 = $" << wallet1;
	cout << " wallet2 = $" << wallet2 << endl;

	cout << "Using references to swap contents: \n";
	swapr(wallet1, wallet2);		// pass variables 
	cout << "wallet1 = $" << wallet1;
	cout << " wallet2 = $" << wallet2 << endl;

	cout << "Using pointers to swap contents: \n";
	swapp(&wallet1, &wallet2);		// pass addresses of variables 
	cout << "wallet1 = $" << wallet1;
	cout << " wallet2 = $" << wallet2 << endl;

	cout << "Trying to use passing by values: \n";
	swapv(wallet1, wallet2);		// pass values of variables 
	cout << "wallet1 = $" << wallet1;
	cout << " wallet2 = $" << wallet2 << endl;

	return 0;
}

void swapr(int & a, int & b)		// use references
{
	int temp;
	temp = a;
	a = b;
	b = temp;
}

void swapp(int * p, int * q)		// use pointers
{
	int temp;

	temp = *p;
	*p = *q;
	*q = temp;
}

void swapv(int a, int b)			// try using values
{
	int temp;
	temp = a;
	a = b;
	b = temp;
}