Loops - execise no 01, slide no 58

package class170629;

import java.util.Scanner;

public class LoopsEx01Slide58 {

    public static void main(String[] args) {
        // input: integer number. example: 123467
        // output: number with the even digits only. example: 246

        // create a scanner
        Scanner s = new Scanner(System.in);

        // ask for input
        System.out.print("Enter an integer number: ");
        // get and save input value
        int n = s.nextInt();

        // close scanner
        s.close();

        int tmp = n; // calculated: number with digits to be checked
        int newNumber = 0;// output: the new number with even digits only
        int weight = 1; // the value of the even digit to be add to newNumber

        // while there are more digits to check
        while (tmp > 0) {
            // calculate most right digit
            int digit = tmp % 10; // calculated: current digit to be checked

            // if even digit then
            if (digit % 2 == 0) {
                // copy it to the new number
                newNumber += digit * weight;

                // update the value of the digit
                weight *= 10;
            }
            tmp /= 10; // drop this digit and continue to check the others
        }

        // display output on the screen
        System.out.printf("input =%d\noutput=%d\n", n, newNumber);

    }

}