Why classes are needed in C Sharp (C#) - See It in Action

Why Classes Are Needed

📖 Scenario: Imagine you are organizing a library. You want to keep track of books with their title, author, and number of pages. Instead of writing separate variables for each book, you can use a class to group all this information together.

🎯 Goal: You will create a simple Book class to hold information about a book. Then, you will create an object of this class and display its details.

📋 What You'll Learn

Create a class named Book with three public fields: Title, Author, and Pages.

Create an object of the Book class named myBook.

Assign the values "The Great Gatsby" to Title, "F. Scott Fitzgerald" to Author, and 180 to Pages.

Print the book details in the format: Title: The Great Gatsby, Author: F. Scott Fitzgerald, Pages: 180.

💡 Why This Matters

🌍 Real World

Classes are used everywhere in software to model real-world things like books, cars, or users, making programs easier to build and understand.

💼 Career

Understanding classes is essential for any software developer because they form the foundation of object-oriented programming, which is widely used in industry.

1

Create the Book class

Create a public class called Book with three public fields: string Title, string Author, and int Pages.

C Sharp (C#)

// Your code here

Need a hint?

Think of a class as a blueprint. Here, Book is the blueprint with fields to hold information.

2

Create a Book object and assign values

Create an object named myBook of type Book. Assign "The Great Gatsby" to myBook.Title, "F. Scott Fitzgerald" to myBook.Author, and 180 to myBook.Pages.

C Sharp (C#)

public class Book
{
    public string Title;
    public string Author;
    public int Pages;
}

// Your code here

Need a hint?

Use new Book() to create the object, then set each field using the dot . operator.

3

Write code to display the book details

Write a Console.WriteLine statement to print the book details in this exact format: Title: The Great Gatsby, Author: F. Scott Fitzgerald, Pages: 180 using myBook fields.

C Sharp (C#)

public class Book
{
    public string Title;
    public string Author;
    public int Pages;
}

Book myBook = new Book();
myBook.Title = "The Great Gatsby";
myBook.Author = "F. Scott Fitzgerald";
myBook.Pages = 180;

// Your code here

Need a hint?

Use string interpolation with $"...{variable}..." to insert values inside the string.

4

Run the program to see the output

Run the program and observe the output. It should exactly print: Title: The Great Gatsby, Author: F. Scott Fitzgerald, Pages: 180

C Sharp (C#)

using System;

public class Book
{
    public string Title;
    public string Author;
    public int Pages;
}

class Program
{
    static void Main()
    {
        Book myBook = new Book();
        myBook.Title = "The Great Gatsby";
        myBook.Author = "F. Scott Fitzgerald";
        myBook.Pages = 180;

        // Your code here
    }
}

Need a hint?

Make sure your output matches exactly, including commas and spaces.