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

```       CheckDigits::M43_001 - compute check digits for Code-39

```

#### SYNOPSIS

```         use Algorithm::CheckDigits;

\$c39 = CheckDigits('code_39');

if (\$c39->is_valid('AB-123K')) {
# do something
}

\$cn = \$c39->complete('AB-123');
# \$cn = 'AB-123K'

\$cd = \$c39->checkdigit('AB-123K');
# \$cd = 'K'

\$bn = \$c39->basenumber('AB-123K');
# \$bn = 'AB-123'

```

#### DESCRIPTION

```   ALGORITHM
1.  After replacing all non numeric letters with their respective values, the sum of all
numbers is computers

2.  The checkdigit is the sum from step 1 taken modulo 43.

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.
```