#include <iostream>
using namespace std;

main()
{
	int code;
	string username, password;
	do
	{
		//Main Menu
		system("cls");
		cout << "--Main Menu--" << endl;
		cout << "[1]Login" << endl;
		cout << "[2]Exit" << endl;

		cout << "\n\nEnter choice: ";
		cin >> code;

		if(code == 1)
		{
			system("cls");
			cout << "--Login Menu--";
			cout << "\n\nEnter username: ";
			cin.ignore();
			getline(cin, username);
			cout << "Enter password: ";
			getline(cin, password);

			if(username == "user" && password == "pass")//validation
			{
				cout << "Login successfully." << endl;
				system("pause");
				do
				{
					system("cls");
					cout << "You are so handsome!" << endl;
					cout << "Do you want to logout? Press 1: ";
					cin >> code;
					if(code == 1)
					{
					}
					else//0 below, 2 above
					{
						cout << "Invalid response." << endl << endl;
						system("pause");
						system("cls");
					}
				}
				while(code != 1);//
			}
			else
			{
				cout << "Invalid username/password." << endl;
			}
			system("pause");
		}
		else if(code == 2)//Exit
		{
			cout << "Thank you for using! Exiting...";
		}
		else//3 above, 0 below
		{
			cout << "Invalid choice." << endl << endl;
			system("pause");
		}
	}
	while(code != 2);//1

}