Question

Using the switch statement, write a menu driven program to :
(i) Generate and display the first 10 terms of the Fibonacci series 0, 1, 1, 2, 3, 5…..
The first two Fibonacci numbers are 0 and 1, and each subsequent number is the sum of the
previous two.
(ii) Find the sum of the digits of an integer that is input.
Sample Input: 15390
Sample Output : Sum of the digits =18
For an incorrect choice, an appropriate error message should be displayed.
(please do not write rubbish)

Answer 1

Answer:

import java.util.Scanner;

public class KboatFibonacciNDigitSum

{

   public static void main(String args[]) {

       Scanner in = new Scanner(System.in);

       System.out.println("1. Fibonacci Series");

       System.out.println("2. Sum of digits");

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

       int ch = in.nextInt();

       switch (ch) {

           case 1:

           int a = 0, b = 1;

           System.out.print(a + " " + b);

           /*

            * i is starting from 3 below

            * instead of 1 because we have  

            * already printed 2 terms of

            * the series. The for loop will  

            * print the series from third

            * term onwards.

            */

           for (int i = 3; i <= 10; i++) {

               int term = a + b;

               System.out.print(" " + term);

               a = b;

               b = term;

           }

           break;

           case 2:

           System.out.print("Enter number: ");

           int num = in.nextInt();

           int sum = 0;

           while (num != 0) {

               sum += num % 10;

               num /= 10;

           }

           System.out.println("Sum of Digits " + " = " + sum);

           break;

           default:

           System.out.println("Incorrect choice");

           break;

       }

   }

}

Explanation: