HW1 example

import java.util.Scanner;
public class HW1Demo {

    /**
     * report bugs to xusun09@gmail.com
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        System.out.println("Please enter the first 9 digits of the ISBN number:");
       
        Scanner keyboard = new Scanner (System.in);
        String number = keyboard.nextLine();
        number = number.replaceAll("-","");
       
        int first   = Integer.parseInt(number.substring(0, 1));
        int second  = Integer.parseInt(number.substring(1, 2));
        int third   = Integer.parseInt(number.substring(2, 3));
        int fourth  = Integer.parseInt(number.substring(3, 4));
        int fifth   = Integer.parseInt(number.substring(4, 5));
        int sixth   = Integer.parseInt(number.substring(5, 6));
        int seventh = Integer.parseInt(number.substring(6, 7));
        int eighth  = Integer.parseInt(number.substring(7, 8));
        int ninth   = Integer.parseInt(number.substring(8, 9));
           
        int tenth = 11 - (10*first + 9*second + 8*third + 7*fourth + 6*fifth + 
                    5*sixth + 4*seventh + 3*eighth + 2*ninth)%11;
           
        System.out.println("The last digit is: " + tenth);
    }
}