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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" CheckDigits::M11_015 \- compute check digits for ESR5 (CH) .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& use Algorithm::CheckDigits; \& \& $ustid = CheckDigits(\*(Aqesr5_ch\*(Aq); \& \& if ($ustid\->is_valid(\*(Aq050001000012000 241170032660178 10304\*(Aq)) { \& # do something \& } \& \& $cn = $ustid\->complete(\*(Aq0001000012000 241170032660178 10304\*(Aq); \& # $cn = \*(Aq050001000012000 241170032660178 10304\*(Aq \& \& $cd = $ustid\->checkdigit(\*(Aq0001000012000 241170032660178 10304\*(Aq); \& # $cd = \*(Aq05\*(Aq \& \& $bn = $ustid\->basenumber(\*(Aq050001000012000 241170032660178 10304\*(Aq); \& # $bn = \*(Aq0001000012000 241170032660178 10304\*(Aq; .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" .SS "\s-1ALGORITHM\s0" .IX Subsection "ALGORITHM" .IP "1." 4 Beginning right all digits are weighted with the repeating sequence 2, 3, 4, 5, 6, 7. .IP "2." 4 The weighted digits are added. .IP "3." 4 The sum from step 2 is taken modulo 11. .IP "4." 4 The checkdigit is 11 minus the sum from step 3. If the difference is 11, the checkdigit is 00. .SS "\s-1METHODS\s0" .IX Subsection "METHODS" .IP "is_valid($number)" 4 .IX Item "is_valid($number)" Returns true only if \f(CW$number\fR consists solely of numbers (with or without space between them) and the first two digits 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$number\fR is computed and inserted before the \&\f(CW$number\fR. .Sp Returns the complete number with check digit or '' if \f(CW$number\fR does not consist solely of digits, spaces. .IP "basenumber($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, \f(CW\*(C`\*(C'\fR .SH "SEE ALSO" .IX Header "SEE ALSO" perl, CheckDigits, \&\fIhttp://www.pruefziffernberechnung.de/E/Einzahlungsschein\-CH.shtml\fR (german), \&\fIhttp://www.sic.ch/de/dl_tkicch_dta.pdf\fR, page 52 (german)