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#

// Base Class
class Product {

  // Private Data Members
  private string name;
  private double price;

  // Getter method for name
  public string GetName(int liters) {
      if (liters == 1) {
          this.name = "Cola";
          return this.name;
      }
      else if (liters == 2) {
          this.name = "Fanta";
          return this.name;
      }
      else if (liters == 3) {
          this.name = "Dew";
          return this.name;
      }
      else return "";
  }

  // Getter method for price
  public double GetPrice(int liters) {
      if (liters == 1) {
          this.price = 2;
          return this.price;
      }
      
      else if (liters == 2) {
          this.price = 3.5;
          return this.price;
      }
  
      else if (liters == 3) {
          this.price = 4;
          return this.price;
      }
      else return 0;
  }

}

// Derived Class
class Beverage : Product { 

    public int Liters { get; set; } //  Liters of a Beverage

    public string GetDetails() {
        string details = GetName(this.Liters) + ", " + GetPrice(this.Liters) + ", " + Liters;
        return details;
    }

}

 
class Demo {

    public static void Main(string[] args) {
        Beverage berverage = new Beverage();
        berverage.Liters = 2;
        Console.WriteLine(berverage.GetDetails());
    }

}

// Base Class
class Vehicle {

  // Private Data Members
  private String speed;
  private String model;

  public Vehicle() { // Default Constructor
    speed = "100";
    model = "Tesla";
  }

  // Getter Function
  public String getSpeed() {
    return speed;
  }

  // Getter Function
  public String getModel() {
    return model; 
  }
}

// Derived Class
class Car { // This line needs to be changed.
  
  public String name; //  Name of a Car
  
  public Car() { // Default Constructor
    name = "";
  }
  
  // This function sets the name of the car
  public void setDetails(String name) { // Setter Function
    this.name = name;
  }

  // This function calls the Base class functions and append the result with input 
  public String getDetails(String carName) {

    String details = carName + ", " + getModel() + ", " + getSpeed(); // calling Base Class Function

    return details;
  } 
}

## Explanation

* **Line 47:** `Beverage` class is derived from the `Product` class. 
* **Line 51-54:** In the `GetDetails()` method, we call the base class' getter methods by passing them the `Liters` as an argument to get the respective `name` and `price` details of the beverage and prepend them to the `Liters` to output the complete details.

This review provides a detailed analysis to solve the 'Implement the Derived Class' challenge.

Introduction to Object-Oriented Programming

Classes and Objects

Data Hiding

Inheritance

Polymorphism

Abstract Classes and Interfaces

Composition, Aggregation and Association

Solution Review: Implement the Derived Class

Solution