Write a menu driven program to perform the following operations i. Calculate the volume of cylinder. (hint : Volume: π × r² × h) ii. Find the factorial of given number. iii. Check the number is Armstrong or not. iv. Exit

import java.util.*;

class Operations

{

     static void cylinder()

     {

          float r,h;

          Scanner sc=new Scanner(System.in);

          System.out.println("Enter radius of cylinder :");

          r=sc.nextFloat();

          System.out.println("Enter height of cylinder :");

          h=sc.nextFloat();

          System.out.println("Volume of cylinder ="+3.142*r*r*h);

     }

     static void fact()

     {

          int n, fact=1;

          Scanner sc=new Scanner(System.in);

          System.out.println("Enter any number :");

          n=sc.nextInt();

          for(int i=1;i<=n;i++)

          {

              fact=fact*i;

          }

          System.out.println("Factorial of "+n+" is : "+fact);

     }

     static void armstrong()

     {

          int n, sum=0, num;

          Scanner sc=new Scanner(System.in);

          System.out.println("Enter any number :");

          n=sc.nextInt();

          int no=n;

          while(n!=0)

          {

               num=n%10;

               sum=sum+(num*num*num);

               n=n/10;

          }

          if(sum==no)

          {

             System.out.println("Number " + no + " is armstrong number");

          }

          else

             System.out.println("Number " + no + " is not armstrong number");

      }

      public static void main(String a[])

      {

            int ch=0;

            Scanner sc=new Scanner(System.in);

            while (ch<=3)

            {

                  System.out.println("1. Volume of cylinder");

                  System.out.println("2. Factorial of number");

                  System.out.println("3. Check if number is armstrong or not");

                  System.out.println("4. Exit");

                 

                  System.out.println("Enter your choice :");

                  ch=sc.nextInt();

                 

                  switch(ch)

                  {

                      case 1: cylinder();

                              break;

                      case 2: fact();

                              break;

                      case 3: armstrong();

                              break;  

                  }

            }

       }

}

         

             

         

/*OUTPUT

1. Volume of cylinder

2. Factorial of number

3. Check if number is armstrong or not

4. Exit

Enter your choice :

1

Enter radius of cylinder :

3

Enter height of cylinder :

4

Volume of cylinder =113.112

1. Volume of cylinder

2. Factorial of number

3. Check if number is armstrong or not

4. Exit

Enter your choice :

2

Enter any number :

4

Factorial of 4 is : 24

1. Volume of cylinder

2. Factorial of number

3. Check if number is armstrong or not

4. Exit

Enter your choice :

3

Enter any number :

43

Number 43 is not armstrong number

1. Volume of cylinder

2. Factorial of number

3. Check if number is armstrong or not

4. Exit

Enter your choice :

4          */