Mathias Weidner > Algorithm-CheckDigits > Algorithm::CheckDigits::M11_015

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Algorithm-CheckDigits-v1.3.0.tar.gz

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NAME ^

CheckDigits::M11_015 - compute check digits for ESR5 (CH)

SYNOPSIS ^

  use Algorithm::CheckDigits;

  $ustid = CheckDigits('esr5_ch');

  if ($ustid->is_valid('050001000012000 241170032660178 10304')) {
        # do something
  }

  $cn = $ustid->complete('0001000012000 241170032660178 10304');
  # $cn = '050001000012000 241170032660178 10304'

  $cd = $ustid->checkdigit('0001000012000 241170032660178 10304');
  # $cd = '05'

  $bn = $ustid->basenumber('050001000012000 241170032660178 10304');
  # $bn = '0001000012000 241170032660178 10304';

DESCRIPTION ^

ALGORITHM

  1. Beginning right all digits are weighted with the repeating sequence 2, 3, 4, 5, 6, 7.
  2. The weighted digits are added.
  3. The sum from step 2 is taken modulo 11.
  4. The checkdigit is 11 minus the sum from step 3. If the difference is 11, the checkdigit is 00.

METHODS

is_valid($number)

Returns true only if $number consists solely of numbers (with or without space between them) and the first two digits are valid check digits according to the algorithm given above.

Returns false otherwise,

complete($number)

The check digit for $number is computed and inserted before the $number.

Returns the complete number with check digit or '' if $number does not consist solely of digits, spaces.

basenumber($number)

Returns the basenumber of $number if $number has a valid check digit.

Return '' otherwise.

checkdigit($number)

Returns the check digits of $number if $number has valid check digits.

Return '' otherwise.

EXPORT

None by default.

AUTHOR ^

Mathias Weidner, <mamawe@cpan.org>

SEE ALSO ^

perl, CheckDigits, http://www.pruefziffernberechnung.de/E/Einzahlungsschein-CH.shtml (german), http://www.sic.ch/de/dl_tkicch_dta.pdf, page 52 (german)

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