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#

// Addition interface
interface IAddition {

  int AddTwo(int num1, int num2);

}

// Calculator Class Implementing the Addition Interface
class Calculator : IAddition {
  
  // Overriding the add method of Addition interface
  public int AddTwo(int num1, int num2) {
    return num1 + num2;
  }
  
}

class Demo {
  
 public static void Main(string[] args) {
   Calculator cal = new Calculator();
   Console.WriteLine(cal.AddTwo(10, 20));
 }
  
}

interface Addition {
  
  int add(int num1, int num2);
}

// Calculator Class Implementing the Addition Interface
class Calculator implements Addition {
  
  // Overriding the add method of addition interface
  public int add(int num1, int num2) {
    
    return num1 + num2;
  }
}

## Explanation

* **Line 9:**  Implemented `IAddition` interface in the `Calculator` class.
* **Line 12-14:** The `AddTwo()` method is implemented inside the `Calculator` class. 

This review provides a detailed analysis to solve the 'Implement an Interface' challenge.

Introduction to Object-Oriented Programming

Classes and Objects

Data Hiding

Inheritance

Polymorphism

Abstract Classes and Interfaces

Composition, Aggregation and Association

Solution Review: Implement an Interface