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CheckDigits::M10_010

NAME

CheckDigits::M10_010 − compute check digits for Postscheckkonti (CH)

SYNOPSIS

  use Algorithm::CheckDigits;
  $pck = CheckDigits('postcheckkonti');
  if ($pck−>is_valid('85−12345678−7')) {
        # do something
  }
  $cn = $pck−>complete('85−12345678');
  # $cn = '85−12345678−7'
  $cd = $pck−>checkdigit('85−12345678−7');
  # $cd = '7'
  $bn = $pck−>basenumber('85−12345678−7');
  # $bn = '85−12345678'

DESCRIPTION

ALGORITHM

1.

The sequence of digits is processed left to right. For the first digit we assume a carry forward of 0.

2.

For each digit d(i) the carry forward cf(i) is the digit at the the position p in the sequence ( 0, 9, 4, 6, 8, 2, 7, 1, 3, 5 ), where p is (d(i) + cf(i−1)) modulo 10.

3.

The check digit is the difference of the sum from step 3 to the next multiple of 10.

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 ’’ if $number does not consist solely of digits and spaces.

basenumber($number)

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

Return ’’ otherwise.

checkdigit($number)

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

Return ’’ otherwise.

EXPORT
None by default.

AUTHOR

Mathias Weidner, <mathias AT weidner DOT in−bad−schmiedeberg.de>

SEE ALSO

perl, CheckDigits, www.pruefziffernberechnung.de.

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