BlueJ Program on Area Surface Area

The valume (V) and surface area (A) of a hollow cylinder of height (H) bounded by external radius (R) and internal radius (r). are given below:

 V=22/7(R^2-r^2).H

 A=2*22/7*H*(R+r)+r*22/7*(R^2-r^2)

 Write a program using user defined functions to print the values of V and A

import java.util.*;

class Date

{

Scanner sc=new Scanner (System.in);

int R,r,H;

double V,A;

 void takeData()

     {

        

          System.out.print("\nEnter external radius:");

          R=sc.nextInt();

          System.out.print("\nEnter internal radius:");

          r=sc.nextInt();

          System.out.print("\nEnter Height:");

          H=sc.nextInt();

        }

       

   void displayArea()

   {

       A=2*22.0/7*H*(R+r)+r*22.0/7*(Math.pow(R,2)-Math.pow(r,2));

       System.out.print("\nArea="+A);

    }

   

void displayVolume()

   {

       V=22.0/7*(Math.pow(R,2)-Math.pow(r,2))*H;

       System.out.print("\nValume="+V);

    } 

          

      public static void main(String args[])

{  

   Date ob=new Date();    

ob.takeData();

ob.displayVolume();

ob.displayArea();  

}

}

Sample Input Output

Enter external radius:12

Enter internal radius:10

Enter Height:5

Valume=691.4285714285713

Area=2074.285714285714

Enter external radius:11

Enter internal radius:10

Enter Height:2

Valume=132.0

Area=924.0