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Discussion started by: Corona688
18 Replies
LEARN ABOUT DEBIAN
algorithm::checkdigits::m10_003
CheckDigits::M10_003(3pm) User Contributed Perl Documentation CheckDigits::M10_003(3pm)NAME
CheckDigits::M10_003 - compute check digits for ISMN
SYNOPSIS
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.
perl v5.10.0 2008-05-17 CheckDigits::M10_003(3pm)