DSA C++ Project – Library Book Management System

Program 1

// Library Book Management System
#include <iostream>
#include <string>
using namespace std;

struct Book 
{
    int id;
    string title;
    string author;
    Book* prev;
    Book* next;
};

class Library 
{
private:
    Book* head;

public:
    Library() 
    {
        head = nullptr;
    }

    // Add a new book
    void addBook(int id, string title, string author) 
    {
        Book* newBook = new Book{id, title, author, nullptr, nullptr};
        if (head == nullptr) {
            head = newBook;
        } else 
        {
            Book* temp = head;
            while (temp->next != nullptr) temp = temp->next;
            temp->next = newBook;
            newBook->prev = temp;
        }
        cout << "Book added successfully.\n";
    }

    // Display all books
    void displayBooks() 
    {
        if (head == nullptr) {
            cout << "Library is empty.\n";
            return;
        }
        Book* temp = head;
        cout << "\nBooks in Library:\n";
        while (temp != nullptr) {
            cout << "ID: " << temp->id << ", Title: " << temp->title << ", Author: " << temp->author << "\n";
            temp = temp->next;
        }
    }
    // Search book by id
    void searchBookById(int id)
    {
        Book *temp=head;
        while(temp!=nullptr)
        {
            if(temp->id==id)
            {
                cout << "Book found: ID = " << temp->id << ", Author = " << temp->author << "\n";
                return;
            }
            temp = temp->next;
        }
        cout << "Book not found with:" <<id<<" id \n";
    }

    // Search book by title
    void searchBook(string title) 
    {
        Book* temp = head;
        while (temp != nullptr) 
        {
            if (temp->title == title) 
            {
                cout << "Book found: ID = " << temp->id << ", Author = " << temp->author << "\n";
                return;
            }
            temp = temp->next;
        }
        cout << "Book not found.\n";
    }

    // Delete a book by ID
    void deleteBook(int id) 
    {
        Book* temp = head;
        while (temp != nullptr && temp->id != id) 
        {
            temp = temp->next;
        }
        if (temp == nullptr) 
        {
            cout << "Book not found.\n";
            return;
        }
        int ch;
        cout << "Book found: ID = " << temp->id << ", Title = " << temp->title <<", Author = " << temp->author << "\n";
        cout<<"\n Are You sure want to delete(1 for Yes)";
       cin>>ch;
       if(ch==1) 
     {
        if (temp->prev != nullptr)
            temp->prev->next = temp->next;
        else
            head = temp->next;

        if (temp->next != nullptr)
            temp->next->prev = temp->prev;

        delete temp;
        cout << "Book deleted successfully.\n";
    }
  }
    // Update a book by ID
    void updateBook(int id) 
    {
        Book* temp = head;
        while (temp != nullptr) 
        {
            if (temp->id == id) 
            {
                cout << "Enter new title: ";
                cin.ignore();
                getline(cin, temp->title);
                cout << "Enter new author: ";
                getline(cin, temp->author);
                cout << "Book updated successfully.\n";
                return;
            }
            temp = temp->next;
        }
        cout << "Book not found.\n";
    }
};

int main() 
{
    Library lib;  // Object of Library class
    int choice, id;
    string title, author;

    do 
    {
        cout << "\n---------------------Library Book Menu--------------------------\n";
        cout << "\t\t1. Add Book\n\t\t2. Display Books\n\t\t3. Search Book\n\t\t4. Delete Book\n\t\t5. Update Book\n\t\t6. Search By Id\n\t\t7.Exit";
        cout<<"\n------------------------------------------------------------\n";
        cout << "Enter your choice: ";
        cin >> choice;

        switch (choice) {
        case 1:
            cout << "Enter Book ID: ";
            cin >> id;
            cin.ignore();
            cout << "Enter Title: ";
            getline(cin, title);
            cout << "Enter Author: ";
            getline(cin, author);
            lib.addBook(id, title, author);
            break;
        case 2:
            lib.displayBooks();
            break;
        case 3:
            cout << "Enter title to search: ";
            cin.ignore();
            getline(cin, title);
            lib.searchBook(title);
            break;
        case 4:
            cout << "Enter Book ID to delete: ";
            cin >> id;
            lib.deleteBook(id);
            break;
        case 5:
            cout << "Enter Book ID to update: ";
            cin >> id;
            lib.updateBook(id);
            break;
        case 6:
            cout << "Enter Book ID to search: ";
            cin >> id;
            lib.searchBookById(id);
            break;
        case 7:
            cout << "Exiting program.\n";
            break;    
        default:
            cout << "Invalid choice!\n";
    

        }
    } while (choice != 7);

    return 0;
}