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

#### NAME

```       CheckDigits::M10_005 - compute check digits for Deutsche Post Identcode/Leitcode (DE)

```

#### SYNOPSIS

```         use Algorithm::CheckDigits;

\$ic = CheckDigits('identcode_dp');

if (\$ic->is_valid('21.802 580.906 6')) {
# do something
}

\$cn = \$ic->complete('21.802 580.906');
# \$cn = '21.802 580.9066'

\$cd = \$ic->checkdigit('21.802 580.906 6');
# \$cd = '6'

\$bn = \$ic->basenumber('21.802 580.906 6');
# \$bn = '21.802 580.906'

```

#### DESCRIPTION

```   ALGORITHM
1.  Beginning left all numbers are weighted alternatively 4 and 9.

3.  The sum of step 3 ist taken modulo 10.

4.  The check digit is the difference between 10 and the number from step 3.

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.
```