Gain insights into OOP with C#. Delve into practical coding examples and exercises, exploring OOP concepts through a real-world vending machine project to understand and apply them effectively.

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Object-oriented programming (OOP) has been around for decades. As the original object-oriented language, C# is a mainstay in the world of computer programming.

All the concepts of object-oriented programming that C# developers love to have in their arsenal are explained in detail along with relevant coding examples and exercises in this course.

This course is unique in its nature as it follows a project-based learning approach. Throughout the course, a real-world example of vending machine is followed to help the learners develop a firm understanding of the stated OOP concepts.

The learners will not only be able to play around with the project,  they’ll also be able to see all the concepts in action in this project.

Learn Object-Oriented Programming in C#

# What Is a Constructor?

> A constructor is a method that is called to create an instance or object of a class.

As the name suggests, the constructor is used to *construct* the object of a class. It is a special method that outlines the steps that are performed when an instance of a class is created in the program. 

>A constructor's **name** must be exactly the **same** as the name of its class.

We have already discussed that to model the *state* of an object we declare member variables or fields in a class.
The intention of implementing a constructor is to put an object in a *predictable initial state*, i.e., to initialize some or all the fields of a class to values that can be specified by the user of the class.  A constructor **does not have a return type**. Not even `void`! It is a good practice to declare/define it as the first member method.

Let's study the different types of constructors and use them to create class objects.

# Default Constructor

The default constructor is the most basic form of a constructor. It is called *default* because when we don't implement a constructor in our class, the compiler, by-default implements one for us at compile time which initializes the fields of that class to their [default values](https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/keywords/default-values-table). Think of it this way: 

> When there is no constructor implemented in a class, a default constructor is always implemented by the compiler automatically. When called, it creates an object in which the fields are initialized to their default values.

This will make sense when we look at the code below. Here, we have our `VendingMachine` class, with its default constructor, and we'll create an object out of it in our `Main()` method:



In this lesson, the world of constructors is explored and you'll learn why they are necessary for creating a class.

Introduction to Object-Oriented Programming

Classes and Objects

Data Hiding

Inheritance

Polymorphism

Abstract Classes and Interfaces

Composition, Aggregation and Association

Constructors

What Is a Constructor?