[Fork] [Fork] Library Management system | C# Online Compiler

[Fork] [Fork] Library Management system by zanihamisi

using System;
using System.Collections.Generic;
using System.Linq;

public class Book
{
    private string title;
    private string author;
    private string isbn;
    public bool IsBorrowed { get; set; }

    public Book(string title, string author, string isbn)
    {
        this.Title = title;
        this.Author = author;
        this.ISBN = isbn;
        this.IsBorrowed = false;
    }

    public string Title
    {
        get { return title; }
        set 
        { 
            if (string.IsNullOrWhiteSpace(value))
                throw new ArgumentException("Title cannot be empty.");
            title = value.Trim();
            title = System.Globalization.CultureInfo.CurrentCulture.TextInfo.ToTitleCase(title);
        }
    }

    public string Author
    {
        get { return author; }
        set 
        { 
            if (string.IsNullOrWhiteSpace(value))
                throw new ArgumentException("Author cannot be empty.");
            author = value.Trim();
            author = System.Globalization.CultureInfo.CurrentCulture.TextInfo.ToTitleCase(author);
        }
    }

    public string ISBN
    {
        get { return isbn; }
        set 
        { 
            if (string.IsNullOrWhiteSpace(value))
                throw new ArgumentException("ISBN cannot be empty.");
            isbn = value.Trim();
        }
    }
}

public class Catalog
{
    public virtual void DisplayMessage()
    {
        Console.WriteLine("This is a catalog.");
    }
}

public class Library : Catalog
{
    private List<Book> books;

    public Library()
    {
        books = new List<Book>();
    }

    public void AddBook()
    {
        Console.Write("Enter book title: ");
        string title = Console.ReadLine();

        Console.Write("Enter book author: ");
        string author = Console.ReadLine();

        Console.Write("Enter book ISBN: ");
        string isbn = Console.ReadLine();

        Book book = new Book(title, author, isbn);
        books.Add(book);

        Console.WriteLine("Book added successfully!");
    }

    public void DisplayBooks()
    {
        foreach (Book book in books)
        {
            Console.WriteLine("Title: " + book.Title + ", Author: " + book.Author + ", ISBN: " + book.ISBN);
        }
    }

    public Book SearchBookByTitle(string title)
    {
        return books.Find(book => book.Title.ToLower() == title.ToLower().Trim());
    }

    public Book SearchBookByAuthor(string author)
    {
        return books.Find(book => book.Author.ToLower() == author.ToLower().Trim());
    }

    public void DeleteBook(string isbn)
    {
        Book book = books.Find(b => b.ISBN == isbn);
        if (book != null)
        {
            books.Remove(book);
            Console.WriteLine("Book deleted successfully!");
        }
        else
        {
            Console.WriteLine("Book not found.");
        }
    }

    public void SortBooks()
    {
        books = books.OrderBy(b => b.Title).ToList();
        Console.WriteLine("Books sorted by title.");
    }

    public void BorrowBook(string isbn)
    {
        Book book = books.Find(b => b.ISBN == isbn);
        if (book != null)
        {
            if (!book.IsBorrowed)
            {
                book.IsBorrowed = true;
                Console.WriteLine("Book borrowed successfully!");
            }
            else
            {
                Console.WriteLine("Book is already borrowed.");
            }
        }
        else
        {
            Console.WriteLine("Book not found.");
        }
    }

    public void ReturnBook(string isbn)
    {
        Book book = books.Find(b => b.ISBN == isbn);
        if (book != null)
        {
            if (book.IsBorrowed)
            {
                book.IsBorrowed = false;
                Console.WriteLine("Book returned successfully!");
            }
            else
            {
                Console.WriteLine("Book is not borrowed.");
            }
        }
        else
        {
            Console.WriteLine("Book not found.");
        }
    }

    public override void DisplayMessage()
    {
        Console.WriteLine("This is a library catalog.");
    }
}

public class Program
{
    public static void Main(string[] args)
    {
        Library library = new Library();

        while (true)
        {
            Console.WriteLine("1. Add book");
            Console.WriteLine("2. Display books");
            Console.WriteLine("3. Search book by title");
            Console.WriteLine("4. Search book by author");
            Console.WriteLine("5. Delete book");
            Console.WriteLine("6. Sort books");
            Console.WriteLine("7. Borrow book");
            Console.WriteLine("8. Return book");
            Console.WriteLine("9. Exit");

            Console.Write("Enter your choice: ");
            int choice = Convert.ToInt32(Console.ReadLine());

            switch (choice)
            {
                case 1:
                    library.AddBook();
                    break;
                case 2:
                    library.DisplayBooks();
                    break;
                case 3:
                    Console.Write("Enter title: ");
                    string title = Console.ReadLine();
                    Book bookByTitle = library.SearchBookByTitle(title);
                    if (bookByTitle != null)
                        Console.WriteLine("Book found! Title: " + bookByTitle.Title + ", Author: " + bookByTitle.Author + ", ISBN: " + bookByTitle.ISBN);
                    else
                        Console.WriteLine("Book not found.");
                    break;
                case 4:
                    Console.Write("Enter author: ");
                    string author = Console.ReadLine();
                    Book bookByAuthor = library.SearchBookByAuthor(author);
                    if (bookByAuthor != null)
                        Console.WriteLine("Book found! Title: " + bookByAuthor.Title + ", Author: " + bookByAuthor.Author + ", ISBN: " + bookByAuthor.ISBN);
                    else
                        Console.WriteLine("Book not found.");
                    break;
                case 5:
                    Console.Write("Enter ISBN of the book to delete: ");
                    string isbnToDelete = Console.ReadLine();
                    library.DeleteBook(isbnToDelete);
                    break;
                case 6:
                    library.SortBooks();
                    break;
                case 7:
                    Console.Write("Enter ISBN of the book to borrow: ");
                    string isbnToBorrow = Console.ReadLine();
                    library.BorrowBook(isbnToBorrow);
                    break;
                case 8:
                    Console.Write("Enter ISBN of the book to return: ");
                    string isbnToReturn = Console.ReadLine();
                    library.ReturnBook(isbnToReturn);
                    break;
                case 9:
                    return;
                default:
                    Console.WriteLine("Invalid choice.");
                    break;
            }
        }
    }
}

​x
 
using System;
using System.Collections.Generic;
using System.Linq;
​
public class Book
{
    private string title;
    private string author;
    private string isbn;
    public bool IsBorrowed { get; set; }
​
    public Book(string title, string author, string isbn)
    {
        this.Title = title;
        this.Author = author;
        this.ISBN = isbn;
        this.IsBorrowed = false;
    }
​
    public string Title
    {
        get { return title; }
        set 
        { 
            if (string.IsNullOrWhiteSpace(value))
                throw new ArgumentException("Title cannot be empty.");
            title = value.Trim();
            title = System.Globalization.CultureInfo.CurrentCulture.TextInfo.ToTitleCase(title);
        }
    }
​
    public string Author
    {
        get { return author; }
        set 
        { 
            if (string.IsNullOrWhiteSpace(value))
                throw new ArgumentException("Author cannot be empty.");
            author = value.Trim();
            author = System.Globalization.CultureInfo.CurrentCulture.TextInfo.ToTitleCase(author);
        }
    }
​
    public string ISBN
    {
        get { return isbn; }
        set 
        { 
            if (string.IsNullOrWhiteSpace(value))
                throw new ArgumentException("ISBN cannot be empty.");
            isbn = value.Trim();
        }
    }
}
​
public class Catalog
{
    public virtual void DisplayMessage()
    {
        Console.WriteLine("This is a catalog.");
    }
}
​
public class Library : Catalog
{
    private List<Book> books;
​
    public Library()
    {
        books = new List<Book>();
    }
​
    public void AddBook()
    {
        Console.Write("Enter book title: ");
        string title = Console.ReadLine();
​
        Console.Write("Enter book author: ");
        string author = Console.ReadLine();
​
        Console.Write("Enter book ISBN: ");
        string isbn = Console.ReadLine();
​
        Book book = new Book(title, author, isbn);
        books.Add(book);
​
        Console.WriteLine("Book added successfully!");
    }
​
    public void DisplayBooks()
    {
        foreach (Book book in books)
        {
            Console.WriteLine("Title: " + book.Title + ", Author: " + book.Author + ", ISBN: " + book.ISBN);
        }
    }
​
    public Book SearchBookByTitle(string title)
    {
        return books.Find(book => book.Title.ToLower() == title.ToLower().Trim());
    }
​
    public Book SearchBookByAuthor(string author)
    {
        return books.Find(book => book.Author.ToLower() == author.ToLower().Trim());
    }
​
    public void DeleteBook(string isbn)
    {
        Book book = books.Find(b => b.ISBN == isbn);
        if (book != null)
        {
            books.Remove(book);
            Console.WriteLine("Book deleted successfully!");
        }
        else
        {
            Console.WriteLine("Book not found.");
        }
    }
​
    public void SortBooks()
    {
        books = books.OrderBy(b => b.Title).ToList();
        Console.WriteLine("Books sorted by title.");
    }
​
    public void BorrowBook(string isbn)
    {
        Book book = books.Find(b => b.ISBN == isbn);
        if (book != null)
        {
            if (!book.IsBorrowed)
            {
                book.IsBorrowed = true;
                Console.WriteLine("Book borrowed successfully!");
            }
            else
            {
                Console.WriteLine("Book is already borrowed.");
            }
        }
        else
        {
            Console.WriteLine("Book not found.");
        }
    }
​
    public void ReturnBook(string isbn)
    {
        Book book = books.Find(b => b.ISBN == isbn);
        if (book != null)
        {
            if (book.IsBorrowed)
            {
                book.IsBorrowed = false;
                Console.WriteLine("Book returned successfully!");
            }
            else
            {
                Console.WriteLine("Book is not borrowed.");
            }
        }
        else
        {
            Console.WriteLine("Book not found.");
        }
    }
​
    public override void DisplayMessage()
    {
        Console.WriteLine("This is a library catalog.");
    }
}
​
public class Program
{
    public static void Main(string[] args)
    {
        Library library = new Library();
​
        while (true)
        {
            Console.WriteLine("1. Add book");
            Console.WriteLine("2. Display books");
            Console.WriteLine("3. Search book by title");
            Console.WriteLine("4. Search book by author");
            Console.WriteLine("5. Delete book");
            Console.WriteLine("6. Sort books");
            Console.WriteLine("7. Borrow book");
            Console.WriteLine("8. Return book");
            Console.WriteLine("9. Exit");
​
            Console.Write("Enter your choice: ");
            int choice = Convert.ToInt32(Console.ReadLine());
​
            switch (choice)
            {
                case 1:
                    library.AddBook();
                    break;
                case 2:
                    library.DisplayBooks();
                    break;
                case 3:
                    Console.Write("Enter title: ");
                    string title = Console.ReadLine();
                    Book bookByTitle = library.SearchBookByTitle(title);
                    if (bookByTitle != null)
                        Console.WriteLine("Book found! Title: " + bookByTitle.Title + ", Author: " + bookByTitle.Author + ", ISBN: " + bookByTitle.ISBN);
                    else
                        Console.WriteLine("Book not found.");
                    break;
                case 4:
                    Console.Write("Enter author: ");
                    string author = Console.ReadLine();
                    Book bookByAuthor = library.SearchBookByAuthor(author);
                    if (bookByAuthor != null)
                        Console.WriteLine("Book found! Title: " + bookByAuthor.Title + ", Author: " + bookByAuthor.Author + ", ISBN: " + bookByAuthor.ISBN);
                    else
                        Console.WriteLine("Book not found.");
                    break;
                case 5:
                    Console.Write("Enter ISBN of the book to delete: ");
                    string isbnToDelete = Console.ReadLine();
                    library.DeleteBook(isbnToDelete);
                    break;
                case 6:
                    library.SortBooks();
                    break;
                case 7:
                    Console.Write("Enter ISBN of the book to borrow: ");
                    string isbnToBorrow = Console.ReadLine();
                    library.BorrowBook(isbnToBorrow);
                    break;
                case 8:
                    Console.Write("Enter ISBN of the book to return: ");
                    string isbnToReturn = Console.ReadLine();
                    library.ReturnBook(isbnToReturn);
                    break;
                case 9:
                    return;
                default:
                    Console.WriteLine("Invalid choice.");
                    break;
            }
        }
    }
}
​

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Cached Result
Last Run:	1:44:57 am
Compile:	0.142s
Execute:	0s
Memory:	8kb
CPU:	0.016s

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