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Algorithm::CheckDigits::MBase_001.3pm
Langue: en
Version: 2008-05-17 (debian - 07/07/09)
Section: 3 (Bibliothèques de fonctions)
NAME
CheckDigits::MBase_001 - compute check digits for UPC (US)SYNOPSIS
use Algorithm::CheckDigits; $rv = CheckDigits('upc'); if ($rv->is_valid('012345678905')) { # do something } $cn = $rv->complete('01234567890'); # $cn = '012345678905' $cd = $rv->checkdigit('012345678905'); # $cd = '5' $bn = $rv->basenumber('012345678905'); # $bn = '01234567890'
DESCRIPTION
ALGORITHM
- 1.
- Add all digits in odd-numbered positions.
- 2.
- Multiply the sum from step 1 with 3.
- 3.
- Add all digits in even-numbered positions.
- 4.
- Add the product from step 2 and the sum from step 3.
- 5.
- If the sum from step 4 is 0 modulo 10, the check digit is 0. Else the check digit is 10 minus the sum from step 4 taken modulo 10.
METHODS
- is_valid($number)
- Returns true only if $number consists solely of numbers and the last digit is a valid check digit according to the algorithm given above.
Returns false otherwise,
- complete($number)
- The check digit for $number is computed and concatenated to the end of $number.
Returns the complete number with check digit or '' if $number does not consist solely of digits and spaces.
- basenumber($number)
- Returns the basenumber of $number if $number has a valid check digit.
Return '' otherwise.
- checkdigit($number)
- Returns the checkdigit of $number if $number has a valid check digit.
Return '' otherwise.
EXPORT
None by default.AUTHOR
Mathias Weidner, <mathias@weidner.in-bad-schmiedeberg.de>THANKS
Aaron W. West pointed me to a fault in the computing of the check digit.SEE ALSO
perl, CheckDigits, www.pruefziffernberechnung.de, www.export911.com/e911/coding/upcChar.htm, www.adams1.com/pub/russadam/upccode.html, http://www.upcdatabase.com.Contenus ©2006-2024 Benjamin Poulain
Design ©2006-2024 Maxime Vantorre