Provided by: libalgorithm-checkdigits-perl_0.50-1_all #### 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,...

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.

EXPORT
None by default.

```

#### AUTHOR

```       Mathias Weidner, <mathias@weidner.in-bad-schmiedeberg.de>

```

#### SEEALSO

```       perl, CheckDigits, www.pruefziffernberechnung.de.
```