CheckDigits::M11_002(3User Contributed Perl DocumentatiCheckDigits::M11_002(3)NAME
CheckDigits::M11_002 - compute check digits for PZN (DE)
SYNOPSIS
use Algorithm::CheckDigits;
$pzn = CheckDigits('pzn');
if ($pzn->is_valid('4877800')) {
# do something
}
$cn = $pzn->complete('487780');
# $cn = '4877800'
$cd = $pzn->checkdigit('4877800');
# $cd = '0'
$bn = $pzn->basenumber('4877800');
# $bn = '487780'
DESCRIPTION
ALGORITHM
1. From left to right beginning with the first position all digits are
multiplied with 2,3,4,...
2. The sum of all products is computed.
3. The checkdigit ist the sum of step 2 taken modulo 11.
4. If the checkdigit is '10' the whole number is not taken as a PZN.
METHODS
is_valid($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 v5.14.1 2009-11-20 CheckDigits::M11_002(3)