Base class and derived class in C Sharp (C#) - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a base class named Animal.

C Sharp (C#)

public class [1] 
{
    public virtual void Speak() 
    {
        Console.WriteLine("Animal sound");
    }
}

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ADog

BAnimal

CCat

DBird

Attempts:

3 left

💡 Hint

Common Mistakes

Using a derived class name like Dog instead of the base class Animal.

The base class should be named Animal as it represents the general class.

2fill in blank

medium

Complete the code to declare a derived class Dog that inherits from Animal.

C Sharp (C#)

public class Dog : [1] 
{
    public void Bark() 
    {
        Console.WriteLine("Woof!");
    }
}

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AAnimal

BFish

CBird

DCat

Attempts:

3 left

💡 Hint

Common Mistakes

Using a class name other than Animal after the colon.

The derived class Dog inherits from the base class Animal.

3fill in blank

hard

Fix the error in the code to call the Speak method from the Dog class instance.

C Sharp (C#)

Dog myDog = new Dog();
myDog.[1]();

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AFly

BBark

CRun

DSpeak

Attempts:

3 left

💡 Hint

Common Mistakes

Calling Bark instead of Speak when the goal is to call the base class method.

The Speak method is defined in the base class Animal and can be called on the Dog instance.

4fill in blank

hard

Fill both blanks to override the Speak method in the Dog class.

C Sharp (C#)

public class Dog : Animal 
{
    public override void [1]() 
    {
        Console.WriteLine([2]);
    }
}

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ASpeak

B"Woof!"

C"Meow!"

DBark

Attempts:

3 left

💡 Hint

Common Mistakes

Using a different method name or wrong string inside Console.WriteLine.

To override the base class method, use Speak and print "Woof!" for the Dog class.

5fill in blank

hard

Fill all three blanks to create a derived class Cat that overrides Speak and adds a new method Purr.

C Sharp (C#)

public class Cat : [1] 
{
    public override void [2]() 
    {
        Console.WriteLine("Meow!");
    }

    public void [3]() 
    {
        Console.WriteLine("Purr...");
    }
}

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AAnimal

BSpeak

CPurr

DDog

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong base class or method names.

The class Cat inherits from Animal, overrides Speak, and adds a new method Purr.