Book _C++

// Online C++ compiler to run C++ program online
#include <iostream>
#include <string>
using namespace std;

struct Sach
{
    string id;
    string tenSach;
    string tacGia;
    int giaBan;
    int namXuatBan;
    
    void nhapSach()
    {
        cout << "Ten sach: ";
        cin.ignore(); // Dung lai cho nhap ten sach
        getline(cin, tenSach);
        
        cout << "Tac gia: ";
        getline(cin, tacGia);
        
        cout << "Gia ban: ";
        cin >> giaBan;
        
        cout << "Nam xuat ban: ";
        cin >> namXuatBan;
    }
    
    void inThongTin()
    {
        cout << "==== Thong tin sach ====\n";
        cout << "Ten sach: " << tenSach << "\n";
        cout << "Tac gia: " << tacGia + "\n";
        cout << "Gia: " << giaBan << "\n";
        cout << "Xuat ban: " << namXuatBan << "\n";
    }
};

int showMenu() {
    cout << "==============";
    cout << "Xin chao! Vui long chon hanh dong ban muon thuc hien:\n";
    cout << "1. Nhap 1 quyen sach moi\n";
    cout << "2. Tim sach\n"; // tim bang ten sach hoac ten tac gia
    cout << "3. Thay doi thong tin sach\n";
    cout << "4. Doc file tu dia cung\n";
    cout << "5. Thay doi thong tin sach\n";
    cout << "6. Sap xep sach";
    cout << "\n";
    cout << "Nhap so de lua chon: ";
    
    int luaChon;
    cin >> luaChon;
    
    return luaChon;
}

void themSach() {
    Sach sach;
    sach.nhapSach();
    sach.inThongTin();
    
    cout << "==============";
    cout << "Ban co muon nhap them sach hay khong? Y/N";
    string yesOrNo;
    cin >> yesOrNo;
    if (yesOrNo == "Y") {
        cout << "Chuan bi nhap sach moi...\n";
        themSach();
    } else {
        showMenu();
    }
}

void timSach() {
    cout << "==============";
    cout << "Nhap ten sach can tim: \n";
    cin.ignore();
    string tenSach;
    getline(cin, tenSach);
    cout << "Dang tim sach " << tenSach << " cho ban. Cho chut...\n";
    cout << "Tim ";
}

int main()
{
    int luaChon = showMenu();
    
    if (luaChon == 1)
    {
        themSach();
    } else if (luaChon == 2) {
        timSach();
    } else if (luaChon == 3) {
        cout << "Nhap ID cua quyen sach ma ban muon thay doi\n";
        int id;
        cin >> id;
        // tim sach bang id (luaChon 2)
        cout << "Khong tim duoc quyen sach nay\n";
    }

    else {
        cout << "May ngu qua, co 1 va 2 thoi.\n";
    }
    
    return 0;
}