CheckDigits::MXX_001(3pm) User Contributed Perl Documentation CheckDigits::MXX_001(3pm)

# NAME¶

CheckDigits::MXX_001 - compute check digits for PA (DE)

# SYNOPSIS¶

```  use Algorithm::CheckDigits;
\$pa = CheckDigits('pa_de');
if (\$pa->is_valid('2406055684D<<6810203<0705109<6')) {
# do something
}
\$cn = \$pa->complete('240605568_D<<681020_<070510_<_');
# \$cn = '2406055684D<<6810203<0705109<6'
\$cd = \$pa->checkdigit('2406055684D<<6810203<0705109<6');
# \$cd = '6'
\$bn = \$pa->basenumber('2406055684D<<6810203<0705109<6');
# \$bn = '240605568_D<<681020_<070510_<_'
```

# DESCRIPTION¶

## ALGORITHM¶

1.
Beginning left all digits are weighted with 7,3,1,7,3,1,...
2.
The sum of those products is computed.
3.
The checksum is the last digit of the sum from step 2 (modulo 10).
4.
Step 1 to 3 is performed for every part of the number and for all 3 parts including the particular checkdigit to compute the total checksum.

## METHODS¶

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,

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.

Returns the basenumber of \$number if \$number has a valid check digit.

Return '' otherwise.

Returns the checkdigit of \$number if \$number has a valid check digit.

Return '' otherwise.

None by default.