BCA JAVA 2015 SLIP 22

import java.io.*;

interface Shape

{

      float pi=3.14f;

      void area();     

}

class Circle implements Shape

{     int r;

      Circle(int r)

      {

            this.r = r;

      }

      public void area()

      {

            System.out.println("Area of Circle = "+(pi*r*r));

      }

     

}

class Sphere implements Shape

{     int r;

      Sphere(int r)

      {     this.r = r;

      }

      public void area()

      {     System.out.println("Area of  Sphere = "+(4*pi*r*r));

      }

}

class Slip22

{    

      public static void main(String a[]) throws IOException

      {    

            BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

            System.out.println("Enter radius for circle : ");

            int r =Integer.parseInt(br.readLine());

           

            Shape s;

            s=new Circle(r);

            s.area();

           

            System.out.println("Enter radius for sphere : ");

             r =Integer.parseInt(br.readLine());

            s=new Sphere(r);

            s.area();

           

      }

}