Oppiskele Haaste: Polymorfismi

Alla olevassa ohjelmassa on yliluokka nimeltä Shape ja kolme perittyä luokkaa nimeltä Rectangle, Square ja Circle. Koodin ongelmana on, että metodeja ei ole ylikirjoitettu oikein, sillä tuloste näyttää arvon 0.0 kaikissa kolmessa Console.WriteLine-lauseessa, mikä tarkoittaa, että perusluokan metodit suoritetaan johdettujen luokkien metodien sijaan.

Muokkaa koodia siten, että kaksi metodia, getArea ja calculatePerimeter, ylikirjoitetaan oikein.

index.cs


              123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107
            
using System;
using System.Collections.Generic;

class Shape
{
    // Perimeter is the length of the 'outline' of a shape
    public float perimeter;

    // Change code below this line
    public float getArea()
    {
        return 0.0f;
    }

    protected float calculatePerimeter()
    {
        return 0.0f;
    }
    // Change code above this line
}

class Rectangle : Shape
{
    float width;
    float height;

    public Rectangle(float width, float height)
    {
        this.width = width;
        this.height = height;
        this.perimeter = this.calculatePerimeter();
    }

    // Change code below this line
    public float getArea()
    {
        return width * height;
    }

    protected float calculatePerimeter()
    {
        return width * 2 + height * 2;
    }
    // Change code above this line
}

class Square : Shape
{
    float length;

    public Square(float length)
    {
        this.length = length * length;
        this.perimeter = calculatePerimeter();
    }

    // Change code below this line
    public float getArea()
    {
        return length * length;
    }

    protected float calculatePerimeter()
    {
        return 4 * length;
    }
    // Change code above this line
}

class Circle : Shape
{
    float radius;

    public Circle(float radius)
    {
        this.radius = radius;
        this.perimeter = calculatePerimeter();
    }

    // Change code below this line
    public float getArea()
    {
        return 3.14f * radius * radius;
    }

    protected float calculatePerimeter()
    {
        return 2.00f * 3.14f * radius;
    }
    // Change code above this line
}

class ConsoleApp
{
    static void Main()
    {
        List<Shape> shapes = new List<Shape>();
        shapes.Add(new Rectangle(10f, 20f));
        shapes.Add(new Square(10f));
        shapes.Add(new Circle(10f));

        foreach (Shape shape in shapes)
        {
            Console.WriteLine(shape.getArea());
        }
    }
}

Käytä perusluokassa virtual-avainsanaa, jotta metodit voidaan ylikirjoittaa.
Lisää jokaisessa johdetussa luokassa override-avainsana metodin määrittelyyn.

index.cs


              123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107
            
using System;
using System.Collections.Generic;

class Shape
{
    // Perimeter is the length of the 'outline' of a shape
    public float perimeter;

    // Change code below this line
    public virtual float getArea()
    {
        return 0.0f;
    }

    protected virtual float calculatePerimeter()
    {
        return 0.0f;
    }
    // Change code above this line
}

class Rectangle : Shape
{
    float width;
    float height;

    public Rectangle(float width, float height)
    {
        this.width = width;
        this.height = height;
        this.perimeter = this.calculatePerimeter();
    }

    // Change code below this line
    public override float getArea()
    {
        return width * height;
    }

    protected override float calculatePerimeter()
    {
        return width * 2 + height * 2;
    }
    // Change code above this line
}

class Square : Shape
{
    float length;

    public Square(float length)
    {
        this.length = length * length;
        this.perimeter = calculatePerimeter();
    }

    // Change code below this line
    public override float getArea()
    {
        return length * length;
    }

    protected override float calculatePerimeter()
    {
        return 4 * length;
    }
    // Change code above this line
}

class Circle : Shape
{
    float radius;

    public Circle(float radius)
    {
        this.radius = radius;
        this.perimeter = calculatePerimeter();
    }

    // Change code below this line
    public override float getArea()
    {
        return 3.14f * radius * radius;
    }

    protected override float calculatePerimeter()
    {
        return 2.00f * 3.14f * radius;
    }
    // Change code above this line
}

class ConsoleApp
{
    static void Main()
    {
        List<Shape> shapes = new List<Shape>();
        shapes.Add(new Rectangle(10f, 20f));
        shapes.Add(new Square(10f));
        shapes.Add(new Circle(10f));

        foreach (Shape shape in shapes)
        {
            Console.WriteLine(shape.getArea());
        }
    }
}

Oliko kaikki selvää?

Kiitos palautteestasi!

Osio 5. Luku 5

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Kysy mitä tahansa tai kokeile jotakin ehdotetuista kysymyksistä aloittaaksesi keskustelumme

Suggested prompts:

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Do you need an explanation of how `virtual` and `override` work in C#?

Awesome!

Completion rate improved to 2.04

Pyyhkäise näyttääksesi valikon

Muokkaa koodia siten, että kaksi metodia, getArea ja calculatePerimeter, ylikirjoitetaan oikein.

index.cs


              123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107
            
using System;
using System.Collections.Generic;

class Shape
{
    // Perimeter is the length of the 'outline' of a shape
    public float perimeter;

    // Change code below this line
    public float getArea()
    {
        return 0.0f;
    }

    protected float calculatePerimeter()
    {
        return 0.0f;
    }
    // Change code above this line
}

class Rectangle : Shape
{
    float width;
    float height;

    public Rectangle(float width, float height)
    {
        this.width = width;
        this.height = height;
        this.perimeter = this.calculatePerimeter();
    }

    // Change code below this line
    public float getArea()
    {
        return width * height;
    }

    protected float calculatePerimeter()
    {
        return width * 2 + height * 2;
    }
    // Change code above this line
}

class Square : Shape
{
    float length;

    public Square(float length)
    {
        this.length = length * length;
        this.perimeter = calculatePerimeter();
    }

    // Change code below this line
    public float getArea()
    {
        return length * length;
    }

    protected float calculatePerimeter()
    {
        return 4 * length;
    }
    // Change code above this line
}

class Circle : Shape
{
    float radius;

    public Circle(float radius)
    {
        this.radius = radius;
        this.perimeter = calculatePerimeter();
    }

    // Change code below this line
    public float getArea()
    {
        return 3.14f * radius * radius;
    }

    protected float calculatePerimeter()
    {
        return 2.00f * 3.14f * radius;
    }
    // Change code above this line
}

class ConsoleApp
{
    static void Main()
    {
        List<Shape> shapes = new List<Shape>();
        shapes.Add(new Rectangle(10f, 20f));
        shapes.Add(new Square(10f));
        shapes.Add(new Circle(10f));

        foreach (Shape shape in shapes)
        {
            Console.WriteLine(shape.getArea());
        }
    }
}

Käytä perusluokassa virtual-avainsanaa, jotta metodit voidaan ylikirjoittaa.
Lisää jokaisessa johdetussa luokassa override-avainsana metodin määrittelyyn.

index.cs


              123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107
            
using System;
using System.Collections.Generic;

class Shape
{
    // Perimeter is the length of the 'outline' of a shape
    public float perimeter;

    // Change code below this line
    public virtual float getArea()
    {
        return 0.0f;
    }

    protected virtual float calculatePerimeter()
    {
        return 0.0f;
    }
    // Change code above this line
}

class Rectangle : Shape
{
    float width;
    float height;

    public Rectangle(float width, float height)
    {
        this.width = width;
        this.height = height;
        this.perimeter = this.calculatePerimeter();
    }

    // Change code below this line
    public override float getArea()
    {
        return width * height;
    }

    protected override float calculatePerimeter()
    {
        return width * 2 + height * 2;
    }
    // Change code above this line
}

class Square : Shape
{
    float length;

    public Square(float length)
    {
        this.length = length * length;
        this.perimeter = calculatePerimeter();
    }

    // Change code below this line
    public override float getArea()
    {
        return length * length;
    }

    protected override float calculatePerimeter()
    {
        return 4 * length;
    }
    // Change code above this line
}

class Circle : Shape
{
    float radius;

    public Circle(float radius)
    {
        this.radius = radius;
        this.perimeter = calculatePerimeter();
    }

    // Change code below this line
    public override float getArea()
    {
        return 3.14f * radius * radius;
    }

    protected override float calculatePerimeter()
    {
        return 2.00f * 3.14f * radius;
    }
    // Change code above this line
}

class ConsoleApp
{
    static void Main()
    {
        List<Shape> shapes = new List<Shape>();
        shapes.Add(new Rectangle(10f, 20f));
        shapes.Add(new Square(10f));
        shapes.Add(new Circle(10f));

        foreach (Shape shape in shapes)
        {
            Console.WriteLine(shape.getArea());
        }
    }
}

Oliko kaikki selvää?

Kiitos palautteestasi!

Osio 5. Luku 5