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Algorithm::CheckDigits::M10_003.3pm
Langue: en
Version: 2008-05-17 (fedora - 05/07/09)
Section: 3 (Bibliothèques de fonctions)
NAME
CheckDigits::M10_003 - compute check digits for ISMNSYNOPSIS
use Algorithm::CheckDigits; $ismn = CheckDigits('ismn'); if ($ismn->is_valid('M-345-24680-5')) { # do something } $cn = $ismn->complete('M-345-24680'); # $cn = 'M-345-24680-5' $cd = $ismn->checkdigit('M-345-24680-5'); # $cd = '5' $bn = $ismn->basenumber('M-345-24680-5'); # $bn = 'M-345-24680'
DESCRIPTION
ALGORITHM
- 1.
- The 'M' as the first number gets the value 3. Beginning left all numbers are weighted alternatively 3 and 1.
- 2.
- The sum of all products is computed.
- 3.
- The sum of step 3 ist taken modulo 10.
- 4.
- The check digit is the difference between 10 and the number from step 3 taken modulo 10.
METHODS
- is_valid($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>SEE ALSO
perl, CheckDigits, www.pruefziffernberechnung.de.Contenus ©2006-2024 Benjamin Poulain
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