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C# Beyond Basics

bookAbstraction Practice

In this task you are given a code you might already be familiar with since you looked at similar code in multiple previous chapters. It contains an overridden method called MakeSound.

Your task is to convert the Animal class into an abstract class and the MakeSound method into an abstract method.

There should be no change in the output of the program after this modification.

index.cs

index.cs

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using System;

class Animal
{
    protected string species;

    public Animal(string species)
    {
        this.species = species;
    }

    public virtual void MakeSound()
    {
        // Empty Method
    }

    public void DisplaySpecies()
    {
        Console.WriteLine($"Species: {species}");
    }
}

class Cat : Animal
{
    string furPattern;

    public Cat(string species, string furPattern) : base(species)
    {
        this.furPattern = furPattern;
    }

    public override void MakeSound()
    {
        Console.WriteLine("Meow! Meow!");
    }
}

class Dog : Animal
{
    float weight;

    public Dog(string species, float weight) : base(species)
    {
        this.weight = weight;
    }

    public override void MakeSound()
    {
        Console.WriteLine("Woof! Woof!");
    }
}

class ConsoleApp
{
    static void Main()
    {
        Animal myCat = new Cat("Feline", "Ginger & White");
        Animal myDog = new Dog("Canine", 42.5f);

        myCat.DisplaySpecies();
        myCat.MakeSound();

        Console.WriteLine("\n");

        myDog.DisplaySpecies();
        myDog.MakeSound();
    }
}
  1. Add the abstract keyword before the Animal class definition to make it abstract.
  2. Add the abstract keyword before the makeSound method's return type in the Animal class to make the method abstract. Make sure to remove the method's body from the Animal class leaving only its blueprint (return type, name and arguments): returnType methodName(arg1, arg2, ..);
index.cs

index.cs

copy

              
1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465

            
using System;

abstract class Animal
{
    protected string species;

    public Animal(string species)
    {
        this.species = species;
    }

    public abstract void MakeSound();

    public void DisplaySpecies()
    {
        Console.WriteLine($"Species: {species}");
    }
}

class Cat : Animal
{
    string furPattern;

    public Cat(string species, string furPattern) : base(species)
    {
        this.furPattern = furPattern;
    }

    public override void MakeSound()
    {
        Console.WriteLine("Meow! Meow!");
    }
}

class Dog : Animal
{
    float weight;

    public Dog(string species, float weight) : base(species)
    {
        this.weight = weight;
    }

    public override void MakeSound()
    {
        Console.WriteLine("Woof! Woof!");
    }
}

class ConsoleApp
{
    static void Main()
    {
        Animal myCat = new Cat("Feline", "Ginger & White");
        Animal myDog = new Dog("Canine", 42.5f);

        myCat.DisplaySpecies();
        myCat.MakeSound();

        Console.WriteLine("\n");

        myDog.DisplaySpecies();
        myDog.MakeSound();
    }
}
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SectionΒ 5. ChapterΒ 9

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bookAbstraction Practice

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In this task you are given a code you might already be familiar with since you looked at similar code in multiple previous chapters. It contains an overridden method called MakeSound.

Your task is to convert the Animal class into an abstract class and the MakeSound method into an abstract method.

There should be no change in the output of the program after this modification.

index.cs

index.cs

copy

              
1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768

            
using System;

class Animal
{
    protected string species;

    public Animal(string species)
    {
        this.species = species;
    }

    public virtual void MakeSound()
    {
        // Empty Method
    }

    public void DisplaySpecies()
    {
        Console.WriteLine($"Species: {species}");
    }
}

class Cat : Animal
{
    string furPattern;

    public Cat(string species, string furPattern) : base(species)
    {
        this.furPattern = furPattern;
    }

    public override void MakeSound()
    {
        Console.WriteLine("Meow! Meow!");
    }
}

class Dog : Animal
{
    float weight;

    public Dog(string species, float weight) : base(species)
    {
        this.weight = weight;
    }

    public override void MakeSound()
    {
        Console.WriteLine("Woof! Woof!");
    }
}

class ConsoleApp
{
    static void Main()
    {
        Animal myCat = new Cat("Feline", "Ginger & White");
        Animal myDog = new Dog("Canine", 42.5f);

        myCat.DisplaySpecies();
        myCat.MakeSound();

        Console.WriteLine("\n");

        myDog.DisplaySpecies();
        myDog.MakeSound();
    }
}
  1. Add the abstract keyword before the Animal class definition to make it abstract.
  2. Add the abstract keyword before the makeSound method's return type in the Animal class to make the method abstract. Make sure to remove the method's body from the Animal class leaving only its blueprint (return type, name and arguments): returnType methodName(arg1, arg2, ..);
index.cs

index.cs

copy

              
1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465

            
using System;

abstract class Animal
{
    protected string species;

    public Animal(string species)
    {
        this.species = species;
    }

    public abstract void MakeSound();

    public void DisplaySpecies()
    {
        Console.WriteLine($"Species: {species}");
    }
}

class Cat : Animal
{
    string furPattern;

    public Cat(string species, string furPattern) : base(species)
    {
        this.furPattern = furPattern;
    }

    public override void MakeSound()
    {
        Console.WriteLine("Meow! Meow!");
    }
}

class Dog : Animal
{
    float weight;

    public Dog(string species, float weight) : base(species)
    {
        this.weight = weight;
    }

    public override void MakeSound()
    {
        Console.WriteLine("Woof! Woof!");
    }
}

class ConsoleApp
{
    static void Main()
    {
        Animal myCat = new Cat("Feline", "Ginger & White");
        Animal myDog = new Dog("Canine", 42.5f);

        myCat.DisplaySpecies();
        myCat.MakeSound();

        Console.WriteLine("\n");

        myDog.DisplaySpecies();
        myDog.MakeSound();
    }
}
Everything was clear?

How can we improve it?

Thanks for your feedback!

SectionΒ 5. ChapterΒ 9
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