main.cpp

#include <iostream>
#include <string>
#include <vector>
#include <limits>

class Book
{
private:
    std::string title;
    std::string author;
    bool isIssued{false};

public:
    Book(std::string title, std::string author)
    {
        this->title = title;
        this->author = author;
    }

    void display() const
    {
        std::cout << "\nTitle: " << title << "\nAuthor: " << author << "\nIssued: " << (isIssued ? "Yes" : "No") << "\n";
    }

    void issue()
    {
        if (isIssued)
        {
            std::cout << "\nBook already issued!";
        }
        else
        {
            isIssued = true;
            std::cout << "\nBook issued successfully!";
        }
    }

    void returnBook()
    {
        if (!isIssued)
        {
            std::cout << "\nCan not return the book that was never issued.";
        }
        else
        {
            isIssued = false;
            std::cout << "\nHope you liked reading this book.";
        }
    }

    std::string getTitle() const
    {
        return title;
    }
};

class Library
{
private:
    std::vector<Book> books;

public:
    void addBooks()
    {
        std::string title, author;

        std::cout << "Enter title: ";
        std::getline(std::cin, title);

        std::cout << "Enter author: ";
        std::getline(std::cin, author);

        books.push_back(Book(title, author));
    }

    void showBooks()
    {
        if (books.empty())
        {
            std::cout << "No books availabe\n";
            return;
        }
        for (int i = 0; i < books.size(); i++)
        {
            std::cout << "\nIndex: " << i;
            books[i].display();
        }
    }

    void issueBook()
    {
        if (books.empty())
        {
            std::cout << "No books availabe";
            return;
        }

        int index;
        std::cout << "Enter the index: ";
        std::cin >> index;

        if (index < 0 || index >= books.size())
        {
            std::cout << "Invalid index\n";
            return;
        }

        books[index].issue();
    }

    void returnBook()
    {
        if (books.empty())
        {
            std::cout << "No books available\n";
            return;
        }

        int index;
        std::cout << "Enter the index: ";
        std::cin >> index;

        if (index < 0 || index >= books.size())
        {
            std::cout << "Invalid index\n";
            return;
        }

        books[index].returnBook();
    }
};

int main()
{
    Library lib;
    int input = 0;

    while (input != 5)
    {
        std::cout << "\nMenu\n"
                  << "1. Add Book\n"
                  << "2. Show Books\n"
                  << "3. Issue Book\n"
                  << "4. Return Book\n"
                  << "5. Exit\n";

        std::cout << "Enter choice: ";
        std::cin >> input;

        std::cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n');

        if (input == 1)
        {
            lib.addBooks();
        }
        else if (input == 2)
        {
            lib.showBooks();
        }
        else if (input == 3)
        {
            lib.issueBook();
        }
        else if (input == 4)
        {
            lib.returnBook();
        }
        else if (input == 5)
        {
            std::cout << "Goodbye!\n";
        }
        else
        {
            std::cout << "Invalid choice\n";
        }
    }

    return 0;
}