1Algorithm::CheckDigits:U:sMe1r1_C0o0n8t(r3i)buted Perl DAolcguomreintthamt:i:oCnheckDigits::M11_008(3)
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NAME

6       CheckDigits::M11_008 - compute check digits for VAT Registration Number
7       (DK)
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SYNOPSIS

10         use Algorithm::CheckDigits;
11
12         $ustid = CheckDigits('ustid_dk');
13
14         if ($ustid->is_valid('13585628')) {
15               # do something
16         }
17
18         $cn = $ustid->complete('1358562');
19         # $cn = '13585628'
20
21         $cd = $ustid->checkdigit('13585628');
22         # $cd = '8'
23
24         $bn = $ustid->basenumber('13585628');
25         # $bn = '1358562';
26

DESCRIPTION

28   ALGORITHM
29       1.  Beginning left every digit is weighted with 2, 7, 6, 5, 4, 3, 2, 1
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31       2.  The weighted digits are added.
32
33       3.  The sum from step 2 is taken modulo 11.
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35       4.  The number is valid if the sum from step 3 is zero (0).
36
37   METHODS
38       is_valid($number)
39           Returns true only if $number consists solely of numbers and the sum
40           computed according to the algorithm given above is 0.
41
42           Returns false otherwise,
43
44       complete($number)
45           Returns $number if $number is valid according to the algorithm
46           given above.
47
48           Return '' otherwise.
49
50       basenumber($number)
51           Returns $number if $number is valid according to the algorithm
52           given above.
53
54           Return '' otherwise.
55
56       checkdigit($number)
57           Returns '' if $number is valid.
58
59           Return undef otherwise.
60
61   EXPORT
62       None by default.
63

AUTHOR

65       Mathias Weidner, "<mamawe@cpan.org>"
66

SEE ALSO

68       perl, CheckDigits, www.pruefziffernberechnung.de,
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72perl v5.30.0                      2019-07-26Algorithm::CheckDigits::M11_008(3)