Algorithm::CheckDigits::M11_010(3pm)

NAME

CheckDigits::M11_010 - compute check digits AHV number (CH)

SYNOPSIS

  use Algorithm::CheckDigits;
  $ahv = CheckDigits('ahv_ch');
  if ($ahv->is_valid('123.45.678.113')) {
        # do something
  }
  $cn = $ahv->complete('123.45.678.11');
  # $cn = '123.45.678.113'
  $cd = $ahv->checkdigit('123.45.678.113');
  # $cd = '3'
  $bn = $ahv->basenumber('123.45.678.113');
  # $bn = '123.45.678.11';

DESCRIPTION

ALGORITHM

1.: Beginning left every digit is weighted with 5,4,3,2,7,6,5,4,3,2.

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. Is the difference 10, the number won't be taken. If the difference is 11, the checkdigit is 0.

METHODS

is_valid($number)

Returns true only if $number consists solely of numbers and dots and the rightmost 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 appended the end of $number.

Returns the complete number with check digit or '' if $number does not consist solely of digits and dots.

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, "<[email protected]>"