Utfordring: Polymorfisme
Programmet nedenfor inneholder en superklasse kalt Shape
og tre avledede klasser kalt Rectangle
, Square
og Circle
. Problemet med koden er at metodene ikke er riktig overskrevet, siden utdataene viser 0.0
for alle de tre Console.WriteLine
-setningene, noe som innebærer at metodene til basisklassen blir kjørt i stedet for metodene til de avledede klassene.
Rediger koden slik at de to metodene, nemlig getArea
og calculatePerimeter
, blir korrekt overskrevet.
index.cs
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107using 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()); } } }
- Bruk
virtual
-nøkkelordet i basisklassen for å gjøre metodene overstyrbare. - I hver avledet klasse, legg til
override
-nøkkelordet i metode-definisjonene.
index.cs
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107using 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()); } } }
Takk for tilbakemeldingene dine!
Spør AI
Spør AI
Spør om hva du vil, eller prøv ett av de foreslåtte spørsmålene for å starte chatten vår
Can you show me the original code so I can help edit it?
Can you explain what the expected output should be after fixing the code?
Do you need an explanation of how `virtual` and `override` work in C#?
Awesome!
Completion rate improved to 2.04
Utfordring: Polymorfisme
Sveip for å vise menyen
Programmet nedenfor inneholder en superklasse kalt Shape
og tre avledede klasser kalt Rectangle
, Square
og Circle
. Problemet med koden er at metodene ikke er riktig overskrevet, siden utdataene viser 0.0
for alle de tre Console.WriteLine
-setningene, noe som innebærer at metodene til basisklassen blir kjørt i stedet for metodene til de avledede klassene.
Rediger koden slik at de to metodene, nemlig getArea
og calculatePerimeter
, blir korrekt overskrevet.
index.cs
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107using 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()); } } }
- Bruk
virtual
-nøkkelordet i basisklassen for å gjøre metodene overstyrbare. - I hver avledet klasse, legg til
override
-nøkkelordet i metode-definisjonene.
index.cs
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107using 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()); } } }
Takk for tilbakemeldingene dine!