Case Study II - Solution

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Introduction Introduction goes here.

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total = 0; total needs to be initialized before loop

Sample Solution Code

import javax.swing.*;
import java.util.Date;

/**
 *
 * This program will read in the first 9 digits of an ISBN and print out the 9 digits
 * along with the valid 10th check digit. This code uses a loop structure to remove redundant code
 * Note that this code will handle the possibility of the check digit being an 'X'.
 *
 * @author:     1010 Instructors
 * @version:    2007-September
 *
 */

public class CaseStudy2_ISBN_Solution  {

	public static void main (String [] args) {

                //variables declared here
		String temp;        //temporary input string
		int isbn;           //9-digit ISBN
		int digit;          //isolated ISBN digit
                int total = 0;      //total of isbn number when each digit is multiplied by check value
	        int checkDigit;     //value of total%11(as per ISBN standard)

                //get input
		temp= JOptionPane.showInputDialog ("Enter first 9 digits of ISBN");
		isbn = Integer.parseInt (temp);

                System.out.println ("You have entered " + temp + ".\n\nThe weighted value of the ISBN is:");

		for (int i=9; i>0; i--) {
			digit = isbn % 10;
			isbn = isbn / 10;
			total = total + digit * i;
			System.out.println (digit + " * " + 9 + " for a running total of " + total);
		}
	
                //calculate check digit
                checkDigit = total % 11;

         	System.out.println ("The weighted total is: " + total);

                //if check digit is equal to 10 then print an 'X', otherwise print the checkDigit value
		if (total%11 == 10) {
			System.out.println ("The check digit is: 'X'");
			System.out.println ("\nThe 10-digit ISBN is: " + temp + 'X');
		}
		else {
			System.out.println ("The check digit is: " + total%11);
			System.out.println ("\nThe 10-digit ISBN is: " + temp + checkDigit);
		}

		System.out.println ("\nProgrammed by COMP 1010 Instructors");
		System.out.println ("Date: " + new Date());
		System.out.println ("*** End of Processing ***");
	}//end main
}//end class

Links To Case Studies

Case Study I: Day One at Funky Books Inc.
Case Study II: Day Two at Funky Books Inc.
Case Study III: Day Three at Funky Books Inc.
Case Study IV: Day Four at Funky Books Inc.