CheckDigits::MXX_003 - compute check digits for DEM
use Algorithm::CheckDigits; $dem = CheckDigits('dem'); if ($dem->is_valid('GD0645027K1')) { # do something } $cn = $dem->complete('GD0645027K'); # $cn = 'GD0645027K1' $cd = $dem->checkdigit('GD0645027K1'); # $cd = '1' $bn = $dem->basenumber('GD0645027K1'); # $bn = 'GD0645027K'
The algorithm is a variation of the Verhoeff scheme.
All letters are changed to numbers.
All digits are permutated according to a permutation table.
The permutated digits are combined using a diëder table. The first with the second, the result with the third, this result with the fourth and so on.
The result of the last combination in the diëder table is in such a way combined that the result is 0 (zero). The number used for this combination is the checksum.
For details look at the source.
Returns true only if $number consists solely of numbers and the last digit is a valid check digit according to the algorithm given above.
$number
Returns false otherwise,
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.
Returns the basenumber of $number if $number has a valid check digit.
Return '' otherwise.
Returns the checkdigit of $number if $number has a valid check digit.
None by default.
Mathias Weidner, <mamawe@cpan.org>
<mamawe@cpan.org>
perl, CheckDigits, www.pruefziffernberechnung.de,
To install Algorithm::CheckDigits, copy and paste the appropriate command in to your terminal.
cpanm
cpanm Algorithm::CheckDigits
CPAN shell
perl -MCPAN -e shell install Algorithm::CheckDigits
For more information on module installation, please visit the detailed CPAN module installation guide.