Loops - execise no 02, slide no 61

package class170629;

import java.util.Scanner;

public class LoopsEx02Slide61 {

    public static void main(String[] args) {
        // input: two integer number. example: n1=37, n2=81
        // output: merged number from n1 and n2. example: 3871
        // example: n1=12, n2=3456, output is: 341526

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

        // ask for input
        System.out.print("Enter the first number: ");
        // get and save input value
        int n1 = s.nextInt();
        // ask for input
        System.out.print("Enter the seconed number: ");
        // get and save input value
        int n2 = s.nextInt();
        // close scanner
        s.close();

        int tmp1 = n1, tmp2 = n2; // calculated: number with digits to be merged
        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 (tmp1 > 0 && tmp2 > 0) {
            // add first digit from tmp2 to newNumber
            newNumber += (tmp2 % 10) * weight;
            // update the value of the digit
            weight *= 10;

            // add first digit from tmp1 to newNumber
            newNumber += (tmp1 % 10) * weight;
            // update the value of the digit
            weight *= 10;

            // drop used (merged) digits from tmp1 and tmp2
            tmp1 /= 10; // drop merged digit from tmp1
            tmp2 /= 10; // drop merged digit from tmp2
        }

        // in case n1 and n2 do not have the same number of digits
        int more = tmp1 > 0 ? tmp1 : tmp2; // the extra digits to be copied to
                                            // the new number
        // add extra digits to newNumber
        newNumber += (more) * weight;

        // display output on the screen
        System.out.printf("n1 =%d, n2=%d\nmerged=%d\n", n1, n2, newNumber);

    }
}