Mathias Weidner > Algorithm-CheckDigits > Algorithm::CheckDigits::M11_002

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Algorithm-CheckDigits-v1.3.2.tar.gz

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# CPAN RT

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Module Version: v1.3.2

# NAME

CheckDigits::M11_002 - compute check digits for PZN (DE)

# SYNOPSIS

```  use Algorithm::CheckDigits;

\$pzn = CheckDigits('pzn');

if (\$pzn->is_valid('4877800')) {
# do something
}

\$cn = \$pzn->complete('487780');
# \$cn = '4877800'

\$cd = \$pzn->checkdigit('4877800');
# \$cd = '0'

\$bn = \$pzn->basenumber('4877800');
# \$bn = '487780'```

# DESCRIPTION

## ALGORITHM

1. From left to right beginning with the first position all digits are multiplied with 2,3,4,...
2. The sum of all products is computed.
3. The checkdigit ist the sum of step 2 taken modulo 11.
4. If the checkdigit is '10' the whole number is not taken as a PZN.

## 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.

None by default.

# AUTHOR

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

# SEE ALSO

perl, CheckDigits, www.pruefziffernberechnung.de.

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