#include <iostream>
#include <stack>

using namespace std;

void showBooks(stack<string> books)
{
    if(!books.empty())
    {
        cout << "\n\tBooks in the stack:" << endl;

        while(!books.empty())
        {
            cout << "\t" << books.top() << endl;
            books.pop();
        }
    }
    else
    {
        cout << "\n\tEmpty stack" << endl;
    }
}

int main()
{
    stack<string> books;
    int opt;
    string name;

    do
    {
        cout << "\nWhat do you want to do?" << endl;
        cout << "1 - Add new book" << endl;
        cout << "2 - Remove a book from the stack" << endl;
        cout << "3 - Show stack size" << endl;
        cout << "4 - Show stack" << endl;
        cout << "5 - Exit" << endl;
        cout << ">>> ";
        cin >> opt;

        switch(opt)
        {
        case 1:
            cin.get();
            cout << "\nName: ";
            getline(cin, name);
            books.push(name);
            break;
        case 2:
            if(!books.empty())
            {
                cout << "\n\tBook Removed: " << books.top() << endl;
                books.pop();
            }
            break;
        case 3:
            cout << "\n\tSize: " << books.size() << endl;
            break;
        case 4:
            showBooks(books);
            break;
        case 5:
            break;
        default:
            cout << "\n\tUnknown option" << endl;
            break;
        }
    }
    while(opt != 5);

    return 0;
}