table of contents
| Algorithm::CheckDigits::MBase_003(3pm) | User Contributed Perl Documentation | Algorithm::CheckDigits::MBase_003(3pm) |
NAME¶
CheckDigits::MBase_003 - compute check digits for SICI (Serial Item and Contribution Identifier)
SYNOPSIS¶
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');
# $bn = '0784-8679(20040308)6:<138>2.0.TX;2-';
DESCRIPTION¶
ALGORITHM¶
- 0
- In the string describing the number all letters (A-Z) are replaced with numbers 10-35 accordingly. All other non-numbers are replaced by 36.
- 1
- Beginning right the numbers at all odd positions are added.
- 2
- The sum from step 1 is multiplied by 3.
- 3
- Beginning right the numbers at all even positions are added.
- 4
- The sums from step 2 and 3 are added.
- 5
- The sum from step 4 is taken modulo 37.
- 6
- The checksum is 37 minus the sum from step 5 where numbers from 10 to 35 are represented by 'A' to 'Z' accordingly and 36 is represented by '#'.
METHODS¶
- is_valid($number)
- Returns true only if the last letter is a valid check letter according to
the algorithm given above.
Returns false otherwise,
- complete($number)
- The check letter for $number is computed and
appended the end of $number.
Returns the complete number with check letter or ''.
- basenumber($number)
- Returns the basenumber of $number if
$number has a valid check digit.
Return '' otherwise.
- checkdigit($number)
- Returns the check letter of $number if
$number has valid check digits.
Return '' otherwise.
EXPORT¶
None by default.
AUTHOR¶
Mathias Weidner, "<mamawe@cpan.org>"
SEE ALSO¶
perl, CheckDigits, www.pruefziffernberechnung.de, http://sunsite.berkeley.edu/SICI/sici.pdf
| 2021-11-17 | perl v5.40.0 |