CheckDigits::M07_001 − compute check digits modulo 7 method 1
use Algorithm::CheckDigits; $m001 = CheckDigits('m001'); if ($m001−>is_valid('1234567892')) { # do something } $cn = $m001−>complete('123456789'); # $cn = '1234567892' $cd = $m001−>checkdigit('1234567892'); # $cd = '2' $bn = $m001−>basenumber('1234567892'); # $bn = '123456789'
ALGORITHM
1. |
All digits are added. |
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2. |
All digits at even positions are added. |
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3. |
The sum of step 1 and 2 is taken modulo 7. |
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4. |
This is the check digit. |
METHODS
is_valid($number)
Returns true only if $number consists solely of numbers and the last digit is a valid check digit according to the algorithm given above.
Returns false otherwise,
complete($number)
The check digit for $number is computed and concatenated to the end of $number.
Returns the complete number with check digit or undef if $number does not consist solely of digits.
basenumber($number)
Returns the basenumber of $number if $number has a valid check digit.
Return undef otherwise.
checkdigit($number)
Returns the check digit belonging to $number or undef if $number does not consist solely of digits.
EXPORT
None by default.
Mathias Weidner, <mathias AT weidner DOT in−bad−schmiedeberg.de>
perl, www.pruefziffernberechnung.de.