Virtual method dispatch mechanism in C Sharp (C#) - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a virtual method named Speak.

C Sharp (C#)

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

Drag options to blanks, or click blank then click option'

Astatic

Boverride

Csealed

Dvirtual

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'override' instead of 'virtual' in base class method declaration.

The virtual keyword allows a method to be overridden in derived classes, enabling virtual method dispatch.

2fill in blank

medium

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

C Sharp (C#)

public class Dog : Animal {
    public [1] void Speak() {
        Console.WriteLine("Dog barks");
    }
}

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Avirtual

Bnew

Coverride

Dsealed

Attempts:

3 left

💡 Hint

Common Mistakes

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

The override keyword is used to provide a new implementation of a virtual method in a derived class.

3fill in blank

hard

Fix the error in the method declaration to correctly override the base class method.

C Sharp (C#)

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

Drag options to blanks, or click blank then click option'

Anew

Boverride

Cvirtual

Dstatic

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'virtual' or 'new' instead of 'override' in derived class.

To override a virtual method from the base class, the derived class method must use the override keyword.

4fill in blank

hard

Fill both blanks to create a dictionary comprehension that maps animal names to their Speak method outputs if the name length is greater than 3.

C Sharp (C#)

var sounds = new Dictionary<string, string> {
    {"Dog", "Bark"},
    {"Cat", "Meow"},
    {"Horse", "Neigh"}
};

var filtered = sounds.Where(kv => kv.Key.[1] > 3)
                      .ToDictionary(kv => kv.Key, kv => kv.[2]);

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ALength

BValue

CKey

DCount

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'Count' instead of 'Length' for string length.

Using 'Key' instead of 'Value' for dictionary value.

The Length property gets the length of the string key, and Value accesses the dictionary value.

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension that maps uppercase animal names to their sounds if the sound length is greater than 3.

C Sharp (C#)

var sounds = new Dictionary<string, string> {
    {"Dog", "Bark"},
    {"Cat", "Meow"},
    {"Horse", "Neigh"}
};

var result = sounds.Where(kv => kv.Value.[1] > 3)
                   .ToDictionary(kv => kv.Key.[2](), kv => kv.[3]);

Drag options to blanks, or click blank then click option'

ALength

BValue

CToUpper

DKey

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'Count' instead of 'Length'.

Using 'Key' instead of 'Value' for the dictionary value.

The Length property checks the length of the sound string, ToUpper() converts the key to uppercase, and Value accesses the sound.