table of contents
CheckDigits::MXX_003(3pm) | User Contributed Perl Documentation | CheckDigits::MXX_003(3pm) |
NAME¶
CheckDigits::MXX_003 - compute check digits for DEM
SYNOPSIS¶
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'); # $bn = 'GD0645027K'
DESCRIPTION¶
ALGORITHM¶
The algorithm is a variation of the Verhoeff scheme.
- 0
- All letters are changed to numbers.
- 1
- All digits are permutated according to a permutation table.
- 2
- The permutated digits are combined using a diëder table. The first with the second, the result with the third, this result with the fourth and so on.
- 3
- The result of the last combination in the diëder table is in such a way combined that the result is 0 (zero). The number used for this combination is the checksum.
For details look at the source.
METHODS¶
- is_valid($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¶
SEE ALSO¶
perl, CheckDigits, www.pruefziffernberechnung.de,
POD ERRORS¶
Hey! The above document had some coding errors, which are explained below:
- Around line 139:
- Expected text after =item, not a number
- Around line 143:
- Expected text after =item, not a number
- Around line 145:
- Non-ASCII character seen before =encoding in 'diëder'. Assuming CP1252
- Around line 149:
- Expected text after =item, not a number
2021-01-03 | perl v5.32.0 |