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#

## Problem Statement

You are given a partially completed code of a `Rectangle` class in the editor. Declare two fields, `length` and `width` and implement a parameterized constructor which assigns parameters to the `length` and `width` fields of the `Rectangle` class.
In the end, Implement the `GetArea()` method which calculates and returns the area of the rectangle.


### Input
```C#
Calls the constructor by passing length and width
Calls the GetArea() method to return the area
```

### Output
```
Returns the area of a rectangle
```
### Sample Input

```C#
Rectangle obj = new Rectangle(2, 2);
```

### Sample Output
```C#
GetArea(); //Returns 4
```



# Problem Statement

You are given a partially completed code of a `Rectangle` class in the editor. Declare two fields, `length` and `width` and implement a parameterized constructor which assigns parameters to the `length` and `width` fields of the `Rectangle` class.
In the end, Implement the `GetArea()` method which calculates and returns the area of the rectangle.


## Input
```C#
Calls the constructor by passing length and width
Calls the GetArea() method to return the area
```

## Output
```
Returns the area of a rectangle
```
## Sample Input

```C#
Rectangle obj = new Rectangle(2, 2);
```

## Sample Output
```C#
GetArea(); //Returns 4
```



Can you implement a rectangle class using the concepts of encapsulation? A solution is placed in the "solution" section to help you, but we suggest you try to solve it on your own first.

Introduction to Object-Oriented Programming

Classes and Objects

Data Hiding

Inheritance

Polymorphism

Abstract Classes and Interfaces

Composition, Aggregation and Association

Challenge 1: Implement the Rectangle Class

Problem Statement

Input

Output

Sample Input

Sample Output