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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

Implement a method `SquaresSum(double num1, double num2, double num3)`, in a class `SumOfSquares`, which takes three numbers, squares them and returns their sum. This is just a refresher to test your knowledge of methods in C#.

### Input
Three `double` numbers.

### Output
The sum of the squares of the passed numbers

### Sample Input
```C#
2, 3, 4
```

### Sample Output
```C#
29
```

# Problem Statement

Implement a method `SquaresSum(double num1, double num2, double num3)`, in a class `SumOfSquares`, which takes three numbers, squares them and returns their sum. This is just a refresher to test your knowledge of methods in C#.

## Input
Three `double` numbers.

## Output
The sum of the squares of the passed numbers

## Sample Input
```C#
2, 3, 4
```

## Sample Output
```C#
29
```

In this challenge, you need to implement a method that squares passing variables and returns their sum.

Introduction to Object-Oriented Programming

Classes and Objects

Data Hiding

Inheritance

Polymorphism

Abstract Classes and Interfaces

Composition, Aggregation and Association

Challenge 1: Square Numbers and Return their Sum

Problem Statement

Input

Output

Sample Input

Sample Output