Question 1 loops

import java.util.Scanner;


public class q1 {

    public static void main(String[] args) {
        // TODO Auto-generated method stub

        Scanner S= new Scanner(System.in);

        System.out.println("enter number:");
        int userNum= S.nextInt();   //the user enter number

        int indexNewNum= 1;         // installed indexer to the result number

        int newNum=0;               // installed the result number

        int num=userNum;            // installed the helper variable <-- userNum

        final int MOOD=2;           // installed the number of the division <-- 2



        while (num>0) {         // run as long as num up to 0

                int moodNum= num%10;    // installed helper variable <-- the right digit

            if(moodNum%MOOD==0){        // if the left digit is double

                newNum+=indexNewNum*moodNum;    //the right digit add to the result number to the left

                indexNewNum*=10;        // the indexer double by 10

            }

            num/=10;        // remove the right digit


        }

        System.out.println("the new number is: "+newNum); // print the result
    }

}