int main()
{
    string agree;
    Books b;
    Date d;
    Bookseller bs;
    Crtificate c;
    ofstream BookInfo;

    // Write to the file
    BookInfo.open("BookInfo2.txt");

    int choice = 0;
    string monthName[] = { "January", "February", "March",
            "April", "May", "June", "July",
            "August", "September", "October",
            "November", "December" };

    do
    {
        //1. Книги
        //2. Издателство
        //3. Купи книга
        cout << "Enter a number from 1 to 3 to choose your command:\n 1 - Books\n 2 - Bookseller\n 3 - Buy a book\n";

        cin >> choice;
        if (choice < 0 && choice > 3) {
            cout << "Incorect number, please try again" << endl;
            cin >> choice;
        }
        cout << "\n";
        cout << "Menu" << endl;
        cout << "-----------------------------------" << endl;

        switch (choice)
        {
        case 1:
            cout << "\n";
            cout << "Enter Books Information:" << endl;
            cout << "-----------------------------------" << endl;
            cout << "";
            b.setBook("" "");
            b.setAuthor("" "");
            b.setNextEdition(1);
            b.setIsbnNumber(1);

            cout << "Entet date DD/MM/YY: ";
            int day, month, year;
            cin >> day >> month >> year;
            cout << endl;
            cout << day << "  " << monthName[month - 1] << "  " << year << endl;
            cin.get();
            cout << endl;
            b.setCirculation(1);

            cout << "Enter yes if this book is agree for certificate." << endl;
            cout << "\n";
            cin >> agree;
            if (agree._Equal("yes")) {
                cout << "\n";
                cout << "This book has certificate from MON!" << endl;
                cout << "\n";
            }
            else {
                cout << "\n";
                cout << "This book has not certificate from MON!" << endl;
                cout << "\n";
            }
            BookInfo << b.getBook();
            BookInfo << b.getAuthor();
            BookInfo << b.getNextEdition();
            BookInfo << b.getIsbnNumber();
            BookInfo << b.getCirculation();
            break;
        case 2:
            cout << "Enter Bookseller Information:" << endl;
            cout << "-----------------------------------" << endl;
            cout << "\n";
            bs.setBookseller("" "");
            bs.setAddress("" "" "" "" "");
            bs.setPhone(1);
            BookInfo << bs.getBookseller();
            BookInfo << bs.getAddress();
            BookInfo << bs.getPhone();

            break;
        case 3:
            cout << "Buy a book:" << endl;
            cout << "-----------------------------------" << endl;

            break;
        default:
            cout << "Invalid choice!";
            cout << "\n";
            break;
        }
    } while (choice != 0);

    // Close the file
    BookInfo.close();
}