Defining Classes, Attributes and Objects

Welcome back! Now that you understand the basics of the Program class and the Main function, it's time to take the next step in your C# journey. In this lesson, we will focus on defining our own classes, attributes, and objects, which are core concepts of Object-Oriented Programming (OOP). C# is an OOP language, and this knowledge is crucial as it forms the basis for creating structured and reusable code.

Object-Oriented Programming (OOP) is a programming paradigm that uses "objects" to design applications and programs. It makes your code more modular, reusable, and easy to maintain. Here's a quick breakdown of its key concepts:

• Class: Think of a class as a blueprint for creating objects. It defines a type and outlines what functionalities that type has.
• Attribute: These are variables defined in a class that hold data about the objects created from the class. For example, an attribute of a Spaceship class might be its name.
• Object: An object is an instance of a class. If the class is a blueprint, the object is the actual creation based on that blueprint. Each object can have different attribute values. For instance, a Spaceship object could have the name "Voyager-1".

In this lesson, you'll learn how to define a class, add attributes, and create objects in C#. Classes act as blueprints for objects, attributes store the data for these objects, and objects are instances of these classes.

Here's a simple code example to illustrate this:

class Spaceship 
{
    // Attribute to store the name, initialized to null
    public string? name;
}

class Program
{
    static void Main()
    {
        // Create an object of the Spaceship class
        Spaceship myShip = new Spaceship();
        
        // Set the name attribute of the spaceship object
        myShip.name = "Voyager-1";
        
        // Print the name of the spaceship to the console
        Console.WriteLine(myShip.name);
    }
}

By the end of this lesson, you'll know how to define a class, add attributes, and create objects just like we did for the Spaceship class.