struct account {
    string  login;
    string  pass;
    bool    admin;
};

bool auth() {
    account user;
    account input;
    ifstream fin("users.bin", ios::binary | ios::in);

    if (fin.is_open()) {
        while (true) {
            system("cls");
            cout << "login: ";
            getline(cin, input.login);
            cout << "pass: ";
            getline(cin, input.pass);

            while (!fin.eof()) {
                fin.read((char*)&user, sizeof(user));

                if (input.login == user.login && input.pass == user.pass) {
                    fin.close();
                    system("cls");
                    cout << "hello, " << user.login << "n" << endl;
                    cout << "press any key...";
                    _getwch();

                    return user.admin;
                }
            }
            system("cls");
            cout << "Incorrect login or passwordn" << endl;
            cout << "press any key...";
            _getwch();

            fin.clear();
            fin.seekg(0, ios::beg);
        }
    }
    else {
        cout << "File is not avalible" << endl;
        abort();
    }
}