Base keyword behavior in C Sharp (C#) - Mini Project: Build & Apply

Base Keyword Behavior

📖 Scenario: Imagine you are creating a simple program to understand how a child class can use and extend the behavior of its parent class in C#.

🎯 Goal: You will build two classes: a parent class called Animal with a method Speak(), and a child class called Dog that overrides Speak() but also calls the parent class's Speak() method using the base keyword.

📋 What You'll Learn

Create a class Animal with a method Speak() that prints "Animal speaks"

Create a class Dog that inherits from Animal

Override the Speak() method in Dog to first call base.Speak() and then print "Dog barks"

Create an instance of Dog and call its Speak() method to see both messages

💡 Why This Matters

🌍 Real World

Understanding how child classes can reuse and extend parent class behavior is key in many software designs, like creating different types of animals, vehicles, or user roles.

💼 Career

Many programming jobs require knowledge of inheritance and the <code>base</code> keyword to write clean, reusable, and maintainable code.

1

Create the Animal class with Speak method

Create a class called Animal with a public method Speak() that prints "Animal speaks".

C Sharp (C#)

# Your code here to create class Animal with Speak method

Need a hint?

Use class Animal and inside it define public void Speak() that uses Console.WriteLine.

2

Create Dog class inheriting Animal

Create a class called Dog that inherits from Animal.

C Sharp (C#)

using System;

class Animal
{
    public void Speak()
    {
        Console.WriteLine("Animal speaks");
    }
}

# Your code here to create class Dog inheriting Animal

Need a hint?

Use class Dog : Animal to inherit from Animal.

3

Override Speak method in Dog and call base.Speak()

In the Dog class, add a public method Speak() that calls base.Speak() and then prints "Dog barks".

C Sharp (C#)

using System;

class Animal
{
    public void Speak()
    {
        Console.WriteLine("Animal speaks");
    }
}

class Dog : Animal
{
    # Your code here to override Speak and call base.Speak()
}

Need a hint?

Use public new void Speak() in Dog, call base.Speak(), then print "Dog barks".

4

Create Dog instance and call Speak

Create an instance of Dog called dog and call dog.Speak() to print both messages.

C Sharp (C#)

using System;

class Animal
{
    public void Speak()
    {
        Console.WriteLine("Animal speaks");
    }
}

class Dog : Animal
{
    public new void Speak()
    {
        base.Speak();
        Console.WriteLine("Dog barks");
    }
}

# Your code here to create Dog instance and call Speak

Need a hint?

Create Dog dog = new Dog(); and call dog.Speak(); inside Main().