Question

Using a switch statement, write a menu driven program to:

1. 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.
2. find the sum of the digits of an integer that is input by the user.
   Sample Input: 15390
   Sample Output: Sum of the digits = 18

For an incorrect choice, an appropriate error message should be displayed.

Answer 1

import java.util.*;
public class Q18.
public static void main(String arg[]){
int n, r, sum = 0, a = 0, b = 0, c = 1; i
Scanner ob = new Scanner(System.in);
System.out.println("***MENU***");
System.out.printIn("1. First ten terms of the Fibonacci series"); 
System.out.printin("2. Sum of the digits of the number entered");
System.out.printIn("Enter your choice..1 or 2)
switc(ob.nextInt())
{case 1: System.out.printIn("**Fibonacci Series***");
for (int i = 1; i <= 10; i++) // FIRST 10 TERMS
                 {a = b;
                 b = c;
                 c = a + b;
System.out.print(a + ", ");
                 }
                 break;
case 2: System.out.println("***Sum of Digits*** \n Enter the number");
n = ob.nextInt();
do{
r = n % 10;
sum += r;
n = 1 / 10;
} while (n > 0);
System.out.println("The sum of the digits is " + sum); 
break;
default: System.out.printIn("Invalid entry");
}
}}