#include <iostream>
#include <cstdlib>

using namespace std;

int main()
{
    string loginuser;
    string loginpass;
    string getuser;
    string getpass;

    cout << "Register.\n\nEnter desired username: " << endl;
    cin >> getuser;
    loginuser = getuser;

    cout << "Enter desired password: " << endl;
    cin >> getpass;
    loginpass = getpass;

    system ("CLS");
    cout << "Enter your username: " << endl;
    cin >> loginuser;

    if (loginuser == getuser) {
        goto pass;
    }

    pass:
    cout << "Enter your password: " << endl;
    cin >> loginpass;

    if (loginpass == getpass) {
        cout << "You are now logged in." << endl;
    }
    else {
        cout << "You entered the wrong password. Go back." << endl;
        goto pass;
    }
}