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.\" ========================================================================
.\"
.IX Title "CheckDigits::M11_012 3pm"
.TH CheckDigits::M11_012 3pm "2021-01-03" "perl v5.32.0" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
CheckDigits::M11_012 \- compute check digits for Bundeswehrpersonenkennnummer (DE)
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&  use Algorithm::CheckDigits;
\&
\&  $bwpk = CheckDigits(\*(Aqbwpk_de\*(Aq);
\&
\&  if ($bwpk\->is_valid(\*(Aq151058\-D\-20711\*(Aq)) {
\&        # do something
\&  }
\&
\&  $cn = $bwpk\->complete(\*(Aq151058\-D\-2071\*(Aq);
\&  # $cn = \*(Aq151058\-D\-20711\*(Aq
\&
\&  $cd = $bwpk\->checkdigit(\*(Aq151058\-D\-20711\*(Aq);
\&  # $cd = \*(Aq1\*(Aq
\&
\&  $bn = $bwpk\->basenumber(\*(Aq151058\-D\-20711\*(Aq);
\&  # $bn = \*(Aq151058\-D\-2071\*(Aq;
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
.SS "\s-1ALGORITHM\s0"
.IX Subsection "ALGORITHM"
.IP "1." 4
Beginning left all digits are weighted 2,3,4,5,6,7,1,6,7,2,3. Letters
are replaced according to the following table:
.Sp
.Vb 8
\&  my %table_to = (
\&        A => 12, B => 14, C => 16, D => 18, E => 20,
\&        F => 22, G => 24, H => 26, I => 28, J => 6,
\&        K => 8, L => 10, M => 12, N => 14, O => 16,
\&        P => 18, Q => 20, R => 22, S => 4, T => 6,
\&        U => 8, V => 10, W => 12, X => 14, Y => 16,
\&        Z => 18,
\&  );
.Ve
.IP "2." 4
The weighted digits are added.
.IP "3." 4
The sum from step 2 is taken modulo 11.
.IP "4." 4
The checksum is 11 minus the sum from step 3.
.Sp
If the difference is 10, the checkdigit is 0.
.Sp
If the difference is 11, the checkdigit is 1.
.SS "\s-1METHODS\s0"
.IX Subsection "METHODS"
.IP "is_valid($number)" 4
.IX Item "is_valid($number)"
Returns true only if \f(CW$number\fR consists solely of numbers and hyphens
and the two digits in the middle
are valid check digits according to the algorithm given above.
.Sp
Returns false otherwise,
.IP "complete($number)" 4
.IX Item "complete($number)"
The check digit for \f(CW$number\fR is computed and inserted into the
middle of \f(CW$number\fR.
.Sp
Returns the complete number with check digit or '' if \f(CW$number\fR
does not consist solely of digits, hyphens and spaces.
.IP "basenumber($number)" 4
.IX Item "basenumber($number)"
Returns the basenumber of \f(CW$number\fR if \f(CW$number\fR has a valid check
digit.
.Sp
Return '' otherwise.
.IP "checkdigit($number)" 4
.IX Item "checkdigit($number)"
Returns the check digits of \f(CW$number\fR if \f(CW$number\fR has valid check
digits.
.Sp
Return '' otherwise.
.SS "\s-1EXPORT\s0"
.IX Subsection "EXPORT"
None by default.
.SH "AUTHOR"
.IX Header "AUTHOR"
Mathias Weidner, <mathias@weidner.in\-bad\-schmiedeberg.de>
.SH "SEE ALSO"
.IX Header "SEE ALSO"
perl,
CheckDigits,
\&\fIwww.pruefziffernberechnung.de\fR,