1. Weighted Codes, Codabar, ISBN & Code 39 Sol: DM.11 Classwork: worksheet Homework (day 47): worksheet

2. Weighted Codes

3. Ex: Determine the check digit that should be appended onto the bank identification number 07100001 1)7(0) + 3(7) + 9(1) + 7(0) +3(0) + 9(0) + 7(0) + 3(1) = 33 2)Therefore the check digit should be three because 33 ends with 3.

4. Codabar- used for credit cards numbers. An extra digit is added to the end of the number for error detection. A)Find the sum of the digits in the positions: 1, 3, 5, 7, 9, 11,13 and 15 B)Double the results C)Count the number of digits in these positions that exceed the number 4 and add this to the result in part (B) D)Add the sum of the remaining digits E)The check digit must bring the final tally to a number that ends in zero.

5. Ex: Determine the check digit that should be appended to the codabar number: 312560019643001 1)3 + 2 + 6 + 0 + 9 + 4 + 0 + 1 = 25 2)25 (2) = 50 3)50 + 2 = 52 4)52 + (1 + 5 + 0 + 1 + 6 + 3 + 0) = 68 5)68 + 2 = 70, therefore 2 is the check digit!

6. International Standard Book Number (ISBN)- is used throughout the world to detect 100% of single and transposition errors.

7. Ex: Consider the ISBN of the book you are reading: 0-7167-3514-4. Verify that the number is legitimate.

8. Code 39

9. Ex: Find the check digit of the following code: 210SA0162322ZA