Lab 11: Polymorphism 1. Two Dimensional Shape a. circle b. square c. triangle Ba

Question

Lab 11: Polymorphism

1. Two Dimensional Shape

a. circle

b. square

c. triangle

Based on the above hierarchy, please define classes as following:

TwoDimensionalShape:

            Member functions: pure virtual function for GetArea

Circle:     Private data member: radius

            Member function: constructor, GetArea

Square:     Private data member: length

            Member function: constructor, GetArea

Triangle:   Private data members: base and height

            Member function: constructor, GetArea

Each TwoDimensionalShape should cotain a virtual function GetArea to calculate the area of the shape. Use the following main function to test your classes.

int main()

{

Circle c(10);

Square s(10);

Triangle t(10,5);

c.GetArea();                                  // will display

Explanation / Answer

interface TwoDimensionalShape {
   int getArea();
}

class Circle implements TwoDimensionalShape{
   private int radius;

   public Circle(int radius) {
       this.radius=radius;
   }
  
   public int getArea(){
       return (int) (Math.PI*radius*radius);
   }
}

class Square implements TwoDimensionalShape{
   private int length;

   public Square(int length) {
       this.length=length;
   }
  
   public int getArea(){
       return (int) (length*length);
   }
}

class Triangle implements TwoDimensionalShape{
   private int base;
   private int height;

   public Triangle(int base, int height) {
       this.base=base;
       this.height=height;
   }
  
   public int getArea(){
       return (int) (base*height)/2;
   }
}

public class TestShape{
   public static void main(String[] args) {

   }
  
   private int main1(){
       int areaCircle = new Circle(10).getArea();
       System.out.println("Area of circle is " + areaCircle);
       int areaSquare = new Square (10).getArea();
       System.out.println("Area of Square is " + areaSquare);
       int areaTriangle = new Triangle(10,5).getArea();
       System.out.println("Area of Triangle is " + areaTriangle);
       TwoDimensionalShape shape[] = { new Circle(5), new Square(5), new Triangle(20,5)};
       return 0;
   }
}

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