#include <iostream>
#include <vector>
using namespace std;

class ISBN {
public:
    short n[3];
    short x;
    char ch_x;
    ISBN() {
        n[0] = NULL; n[1] = NULL; n[2] = NULL; x = NULL;
    }
    ISBN(short n0, short n1, short n2, short x1)
    {
        if (n0 < 10000 && n1 < 10000 && n2 < 10000 && x1 < 10) {
            n[0] = n0; n[1] = n1; n[2] = n2; x = x1; //ch_x = NULL;
        }
        else cerr << "Something is wrong!";
    }
    ISBN(short n0, short n1, short n2, char x1)
    {
        if (n0 < 10000 && n1 < 10000 && n2 < 10000 && x1 <= 'z') {
            n[0] = n0; n[1] = n1; n[2] = n2; ch_x = x1; // x = NULL;
        }
        else cerr << "Something is wrong!";
    }

};

class Date {
public:
    enum Month {
        jan = 1, feb, mar, apr, may, jun, jul, aug, sep, oct, nov, dec
    };
    Date()
        :y(2001), m(jan), d(1) { };
    Date(int y, Month m, int d)
        :y(y), m(m), d(d) { };
    Month int_to_month(int x)
    {
        while (x < jan || dec < x);
        { cerr << "неправильный месяц, введите новый: "; cin >> x; }
        return Month(x);
    }
//protected:
    int y;
    Month m;
    int d;
};

/*
Month Date::Month int_to_month(int x)
{
    if (x < jan || dec < x);
    cerr << "неправильныймесяц";
    return Month(x);
}
*/

class Patron {
public:
    string username() const { return Username; }
    int number() const { return num; }
    double vznos() const { return vzn; }
    void set_vznos(Patron &p, double vznos) {
        p.vzn = vznos;
    }
    bool check_vznos(const Patron& p) const;
private:
    string Username;
    int num;
    double vzn = 0;

};

bool Patron::check_vznos(const Patron& p) const
{
    if (p.vznos() != 0)
        return false;

    return true;
}

class Book {
public:
    enum Genre {
        Fantastic = 1, Prose, Periodic, Biography, Kid
    };
    ISBN code;
    string bookname;
    Genre genre;
    string Surname;
    Date copyright;
    bool on_hands;

    Book(short n0, short n1, short n2, short x, string book_name, Genre g, string Sur_name, int year, int month, int day, bool given)
    {
        code.n[0] = n0; code.n[1] = n1; code.n[2] = n2; code.x = x;
        bookname = book_name;
        genre = g;
        Surname = Sur_name;
        copyright.y = year; copyright.m = Date::int_to_month(month); copyright.d = day;
        on_hands = given;
    };
    bool is_given(const Book& book) const;
};

bool Book::is_given(const Book &book) const
{
    return book.on_hands;
}

class Library {
    struct Transaction {
        Book Book;
        Patron Patron;
        Date Date;
    };
    vector<Book> Lib_Books;
    vector<Patron> Patrons;
    vector<Transaction> Transactions;
    void add_book(Library& Lib, string bookname)
    {
        Lib.Lib_Books.push_back(bookname);
    }

};

bool operator==(const Book& book1, const Book& book2)
{
    if (book1.code.n[0] == book2.code.n[0]
        && book1.code.n[1] == book2.code.n[1]
        && book1.code.n[2] == book2.code.n[2]
        && book1.code.x == book2.code.x)
        return true;

    return false;
}

bool operator!=(Book& book1, Book& book2)
{
    return !(book1 == book2);
}

/*
ostream& operator<<(ostream& os, Book& book.code)
{

}
*/

ostream& operator<<(ostream& os, const Book& book)
{
    os << "Book name: " << book.bookname << "Author: " << book.Surname << "ISBN: " << book.code.n[0] << '-' << book.code.n[1] << '-' << book.code.n[2] << '-' << book.code.x;
    return os;
}


int main()
{

}