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Manual Reference Pages  -  ALGORITHM::CHECKDIGITS::M11_015 (3)

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NAME

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

CONTENTS

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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perl v5.20.3 ALGORITHM::CHECKDIGITS::M11_015 (3) 2016-03-17

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