Is-a relationship mental model in C Sharp (C#) - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare that Dog is a type of Animal using inheritance.

C Sharp (C#)

class Animal {}
class Dog : [1] {}

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AAnimal

BDog

CObject

DCreature

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong class name after the colon.

Forgetting the colon and just writing the class name.

In C#, to show that Dog is a type of Animal, Dog must inherit from Animal using a colon and the base class name.

2fill in blank

medium

Complete the code to override the Speak method in the Dog class.

C Sharp (C#)

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

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ASpeak

BMakeNoise

CSound

DTalk

Attempts:

3 left

💡 Hint

Common Mistakes

Using a different method name that does not match the base class.

Forgetting to use the override keyword.

The Dog class overrides the Speak method from Animal. The method name must match exactly to override it.

3fill in blank

hard

Fix the error in the code by completing the inheritance declaration.

C Sharp (C#)

class Vehicle {}
class Car [1] Vehicle {
    public void Drive() {
        Console.WriteLine("Driving");
    }
}

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Ainherits

B:

Cextends

Dimplements

Attempts:

3 left

💡 Hint

Common Mistakes

Using Java or other language keywords like 'extends' or 'inherits'.

Using 'implements' which is for interfaces.

In C#, inheritance is declared using a colon (:), not words like 'inherits' or 'extends'.

4fill in blank

hard

Complete the code to create a class Cat that inherits from Animal and overrides the Speak method.

C Sharp (C#)

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

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A:

Boverride

Cvirtual

Dimplements

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'virtual' instead of 'override' in the derived class.

Using 'implements' instead of ':' for inheritance.

The Cat class inherits from Animal using a colon (:). The Speak method overrides the base method using the override keyword.

5fill in blank

hard

Fill both blanks to define a class Bird that inherits from Animal, overrides Speak, and calls the base Speak method inside it.

C Sharp (C#)

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

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A:

Boverride

Cbase

Dvirtual

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting to call the base method inside the override.

Using 'virtual' instead of 'override' in the derived class.

Using wrong syntax for inheritance.

Bird inherits from Animal using ':'. It overrides Speak with 'override'. Inside Speak, it calls the base class method using 'base.Speak()'.