Question 3 loops

import java.util.Scanner;


public class q3 {

    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 biggerNum= userNum%10;      //installed the variable to the result <-- the left digit

        int HuserNum= userNum/10;       // installed the helper variable <-- userNum lass the left digit

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

            if (biggerNum < HuserNum%10) {  //if biggerNum greater than the left digit

                biggerNum= HuserNum%10;     // biggerNum <-- the left digit
            }

            HuserNum/=10;       // remove the right digit

        }

        System.out.println("the bigest digit is: "+ biggerNum); // print the result

    }

}