Mine

/*
File: Encrypt-Decrypt.cpp
Author: Brolly
Description: encryption/decryption
Date: 31/04/07
*/

#include <iostream>
#include <string>
using namespace std;

void encrdecr();
void cls();
void pause();

string txt;
string key;

void main()
{
	int choice=0;
	
	do {
	cls();
	cout << "\n\t\t\t1. Encrypt" << endl;
	cout << "\t\t\t2. Decrypt" << endl;
	cout << "\t\t\t3. Exit" << endl;
	cin >> choice;
	}while((choice!=1) && (choice!=2) && (choice!=3));
	if(choice==1) {
		cls();
		encrdecr();
	}
	else if(choice==2) {
		cls();
		encrdecr();
	}
	else if(choice==3)
		exit(0);
}

void encrdecr() {
	cout << "Enter text: " << endl;
	cin >> txt;
	cout << endl << "Key: ";
	cin >> key;
	for(int i=0;i<txt.length();i++)
		txt[i]=txt[i]^key[i%key.length()];
	cout << endl << "Text: " << endl << txt << endl << endl;
	pause();
	cls();
	main();
}

void cls() {
	system("cls");
}

void pause() {
	system("pause");
}