Algorithm::CheckDigits::MBase_003(3pm) User Contributed Perl Documentation Algorithm::CheckDigits::MBase_003(3pm)

CheckDigits::MBase_003 - compute check digits for SICI (Serial Item and Contribution Identifier)

  use Algorithm::CheckDigits;
  $sici = CheckDigits('sici');
  if ($sici->is_valid('0784-8679(20040308)6:<138>2.0.TX;2-H')) {
        # do something
  }
  $cn = $sici->complete('0784-8679(20040308)6:<138>2.0.TX;2-');
  # $cn = '0784-8679(20040308)6:<138>2.0.TX;2-H'
  $cd = $sici->checkdigit('0784-8679(20040308)6:<138>2.0.TX;2-H');
  # $cd = 'H'
  $bn = $sici->basenumber('0784-8679(20040308)6:<138>2.0.TX;2-H');
  # $bn = '0784-8679(20040308)6:<138>2.0.TX;2-';

ALGORITHM

0
In the string describing the number all letters (A-Z) are replaced with numbers 10-35 accordingly. All other non-numbers are replaced by 36.
1
Beginning right the numbers at all odd positions are added.
2
The sum from step 1 is multiplied by 3.
3
Beginning right the numbers at all even positions are added.
4
The sums from step 2 and 3 are added.
5
The sum from step 4 is taken modulo 37.
6
The checksum is 37 minus the sum from step 5 where numbers from 10 to 35 are represented by 'A' to 'Z' accordingly and 36 is represented by '#'.

METHODS

Returns true only if the last letter is a valid check letter according to the algorithm given above.

Returns false otherwise,

The check letter for $number is computed and appended the end of $number.

Returns the complete number with check letter or ''.

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

Return '' otherwise.

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

Return '' otherwise.

EXPORT

None by default.

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

perl, CheckDigits, www.pruefziffernberechnung.de, http://sunsite.berkeley.edu/SICI/sici.pdf

2022-10-13 perl v5.36.0