Learning Project #3: Caesar Cipher

#include "stdafx.h"
#include <stdio.h>
#include <stdlib.h>
#include <iostream>
#include <string>

using namespace std;

const int SHIFT = 3;

string doEncrypt( string plainText );
string doDecrypt( string encryptedText );

int main()
{

    cout << "Learning Project #3: Caesar Chiper" << endl;
    string textToEncrypt = "the quick brown fox jumps over the lazy dog";
    cout << "Text to Encrypt: " << textToEncrypt << endl;
    string textEncrypted = doEncrypt( textToEncrypt );
    cout << "Encrypted Text: " << textEncrypted << endl;
    string textDecrypted = doDecrypt(textEncrypted);
    cout << "Decrypted Text: " << textDecrypted << endl;

    // Bad form, so sue me.
    system("PAUSE");

    return 1;
}

string doEncrypt( string plainText )
{

    string encryptedText = "";
    for( unsigned int i = 0; i < plainText.length(); i++ )
    {

        int temp1 = int(plainText[i]) + SHIFT;
        char temp2 = char(temp1);
        encryptedText += temp2;
    }

    return encryptedText;
}

string doDecrypt( string plainText )
{
    string decryptedText = "";
    for( unsigned int i = 0; i < plainText.length(); i++ )
    {

        int temp1 = int(plainText[i]) - SHIFT;
        char temp2 = char(temp1);
        decryptedText += temp2;
    }

    return decryptedText;
}