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  1. using System;
  2. using System.Collections.Generic;
  3.  
  4. namespace BookExample
  5. {
  6.  
  7.     public class Book
  8.     {
  9.  
  10.         public string Title { get; private set; }
  11.         public string Author { get; private set; }
  12.         public decimal Price { get; private set; }
  13.  
  14.  
  15.         public Book(string title, string author, decimal price)
  16.         {
  17.  
  18.             Title = title;
  19.             Author = author;
  20.             Price = price;
  21.         }
  22.  
  23.  
  24.         public void DisplayDetails()
  25.         {
  26.             Console.WriteLine($"Title: {Title}");
  27.             Console.WriteLine($"Author: {Author}");
  28.             Console.WriteLine($"Price: ${Price:F2}");
  29.         }
  30.     }
  31.  
  32.  
  33.     public class Librarian
  34.     {
  35.  
  36.         private List<Book> _books;
  37.  
  38.  
  39.         public Librarian()
  40.         {
  41.             _books = new List<Book>();
  42.         }
  43.  
  44.  
  45.         public void AddBook(Book book)
  46.         {
  47.             _books.Add(book);
  48.             Console.WriteLine($"Added book: {book.Title}");
  49.         }
  50.  
  51.  
  52.         public void DisplayAllBooks()
  53.         {
  54.             if (_books.Count == 0)
  55.             {
  56.                 Console.WriteLine("No books in the library.");
  57.                 return;
  58.             }
  59.  
  60.             Console.WriteLine("Books in the library:");
  61.             foreach (var book in _books)
  62.             {
  63.                 book.DisplayDetails();
  64.                 Console.WriteLine();
  65.             }
  66.         }
  67.     }
  68.  // we should use the Dip principe here by adding interface item instead of make the librian deal with just books but its just a simple program to demonstrate the SRP 
  69.  
  70.     class Program
  71.     {
  72.         static void Main(string[] args)
  73.         {
  74.  
  75.             Librarian librarian = new Librarian();
  76.  
  77.  
  78.             Book book1 = new Book("The Great Gatsby", "F. Scott Fitzgerald", 12.99m);
  79.             Book book2 = new Book("1984", "George Orwell", 9.99m);
  80.             Book book3 = new Book("To Kill a Mockingbird", "Harper Lee", 10.99m);
  81.  
  82.  
  83.             librarian.AddBook(book1);
  84.             librarian.AddBook(book2);
  85.             librarian.AddBook(book3);
  86.  
  87.  
  88.             librarian.DisplayAllBooks();
  89.         }
  90.     }
  91. }
Success #stdin #stdout 0.06s 29064KB
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stdin
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Standard input is empty
stdout
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Added book: The Great Gatsby
Added book: 1984
Added book: To Kill a Mockingbird
Books in the library:
Title: The Great Gatsby
Author: F. Scott Fitzgerald
Price: $12.99

Title: 1984
Author: George Orwell
Price: $9.99

Title: To Kill a Mockingbird
Author: Harper Lee
Price: $10.99
https://ideone.com/dyRyAT
language:
C# (NET 6.0)
created:
8 days ago
visibility:
public

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