Barcode UPC ( Universal Product Code)  Commonly known as barcode  “Barcodes are black and white lines of varying widths followed underneath by a series of numbers.”  Consists of 12 numerical digits, which are uniquely assigned in each trade item.  Most common form is UPC-A.

FORMATTING Most common formatting used today is the UPC-A Composed of 3 segments  Manufacturer’s number ( 6-9 digits)  Product number ( 2-5 digits)  Check number Number System Variations

FORMATTING… Product category – first number Manufacturer’s Number – the next 5 digits Product Number – the next 5 digits; defines the specific product Check Number- the last digit EAN – 13 is the superset of UPC ( adding a digit at the beginning of the UPC) but this does not change the check digit.

CHECK DIGITS 1. Add the digits in the odd-numbered position (first, third, fifth, etc.) together and multiply by three. 2. Add the digits in the even-numbered positions (second, fourth, sixth, etc.) to the result in step Find the result modulo If the result is not zero, subtract the result from ten. Universal Product Code. In Wikipedia, the free encyclopedia.Retrieved February 28, 2013 from ( Product Code. In Wikipedia, the free encyclopedia.Retrieved February 28, 2013 from (

EXAMPLE x where x is the unknown digit Adding the odd-numbered digits: ( ) * 3 = 14(3) = 42 Adding the even-numbered digits: ( ) = 16 Add = 58 Calculate: 58 modulo 10 = 8 Subtract from 10: 10 – 8 = 2 Therefore the check digit is 2.

LET’S HAVE A SHORT

X Y Z Solve for the check digit.

Number System 0, 1, 6, 7, 8 – most products 2 – local use ( fruits, vegetables and meat) 3- drugs 4 – local use (loyalty cards or store coupons) 5 – coupons ( can be doubled or tripled) 9 – coupons ( can’t be doubled or tripled)

VARIATIONS UPC-E ( zero suppressed version of UPC) EAN – superset of UPC UPC digit supplement of UPC UPC-C - 12 digit code with a check digit UPC-D - variable length code (12 digits or more) with the 12th digit being the check digit UPC-B - 12-digit version of UPC with no check digit

Double every odd-numbered digits Add these new digits to the undoubled ones. Note: All double digit numbers are added as a sum of their digits. If the final sum is divisible by 10 then the credit card number is valid. Example

LET’S HAVE A SHORT

Try to see if the credit card is valid.

References: Universal Product Code. In Wikipedia, the free encyclopedia. Retrieved February 28, 2013, from ( Summers, Veronica. How to decode a barcode algorithm. (n.d.). Retrieved February 28, 2013, from ( barcode-algorithm.html) barcode-algorithm.html Johnson, Kimberly. How to Understand Barcodes. (n.d.). Retrieved February 28, 2013, from,( barcodes.html) barcodes.html Moore, Ann. Barcode Interpretation. (n.d.) Retrieved February 28, 2013, from ( Cracking the Credit Card Code. ( January 20, 2011.) Retrieved February 28, 2013, from (