Java Programs - Solved 2012 ICSE Computer Science Paper

import java.util.Scanner;
class Menu{
    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 choice = Integer.parseInt(in.nextLine());
        switch(choice){
        case 1:
            int a = 0;
            int b = 1;
            int c = 0;
            System.out.print(a + " " + b);
            for(int i = 3; i <= 10; i++){
                c = a + b;
                System.out.print(" " + c);
                a = b;
                b = c;
            }
            System.out.println();
            break;
        case 2:
            System.out.print("Enter the number: ");
            int n = Integer.parseInt(in.nextLine());
            int sum = 0;
            for(int i = n; i != 0; i /= 10)
                sum += i % 10;
            System.out.println("Sum of digits: " + sum);
            break;
        default:
            System.out.println("Invalid choice!");
        }
    }
}