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# Manual Reference Pages  -  ALGORITHM::CHECKDIGITS::M43_001 (3)

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### 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.

None by default.

### AUTHOR

Mathias Weidner, <mamawe@cpan.org>