#include <iostream>
#include <fstream>
#include <string>

using namespace std;

int main()
{
    // Open userDB.dat for input
    ifstream inUserDB("C:/userDB.dat");
    // Open userDB.dat for output, and app (append) will add new text without removing the old
    ofstream outUserDB("C:/userDB.dat", ios_base::app);
    string checkUser;
    string userIn;
    string passIn;
    string newUser;
    string newPass;

    cout << "Username: ";
    cin >> userIn;
    cout << "Password: ";
    cin >> passIn;
    inUserDB >> checkUser; // converts the text in userDB.dat to the string

    if (userIn != checkUser || passIn != checkUser) // if what the user inputted does not match the database
    {
        cout << "LOGIN FAILED.";
    }
    else
    {
        cout << "Welcome " << userIn;
        cout << "\nPlease enter the username you would like to add to the database: ";
        cin >> newUser;
        cout << "Please enter a password to be added to the new username: ";
        cin >> newPass;

        outUserDB << "\n\n" << newUser << "\n" << newPass; // Adds the new user/pass to the database

        system("PAUSE");
    }

    system("PAUSE");
}