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 an interface, `IAddition`, which contains a method signature `int AddTwo(int num1, int num2).` You need to write a class called `Calculator` which implements the `IAddition` interface.

The `AddTwo(int num1, int num2)` method takes two integers and returns their sum.

## Input
Calling the `AddTwo(int num1, int num2)` method by passing `num1` and `num2`.

## Output
Returns the addition of `num1` and `num2`.

## Sample Input

```c#
Calculator cal = new Calculator();
cal.AddTwo(10, 20);
```

## Sample Output

```c#
30
```



Can you implement an interface in your class? A solution is placed in the solution section to help you, but we would 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 2: Implement an Interface

Problem Statement