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

Write a C# **class** called `Calculator` with: 

* `private` *fields*: 

  * `_num1` and `_num2` (**double** type)
* *Methods*:

  * `Add()`, a *method* which returns the sum of two numbers.

  * `Subtract()`, a *method* which returns the difference of `_num1` and `_num2` (num2 - num1).
 
  * `Multiply()`, a *method* which returns the result of multiplication of numbers.

  * `Divide()`, a *method* which returns the result of division of `_num2` by `_num1`.

* Define a parameterized constructor which takes two parameters `num1` and `num2` and assigns these parameters to the respective fields in the class.

## Input
Passing numbers in the parameterized constructor

## Output
Addition, Subtraction, Division, and Multiplication

## Sample Input

``` java
Calculator calc = new Calculator(10, 94);
calc.Add()
calc.Subtract()
calc.Multiply()
calc.Divide()
```
## Sample Output
``` c#
104
84
940
9.4
```

In this exercise, you have to implement a calculator which can perform addition, subtraction, multiplication, and division.

Introduction to Object-Oriented Programming

Classes and Objects

Data Hiding

Inheritance

Polymorphism

Abstract Classes and Interfaces

Composition, Aggregation and Association

Challenge 4: Implement a Calculator Class

Problem Statement