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Ingy döt Net 2023-07-01 11:58:00 -04:00
parent 7387c8f97b
commit cb5bb5e222
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Task/ISBN13-check-digit/Mathematica/isbn13-check-digit.math Normal file
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ClearAll[ValidISBNQ]
ValidISBNQ[iban_String] := Module[{i},
i = StringReplace[iban, {" " -> "", "-" -> ""}];
If[StringMatchQ[i, Repeated[DigitCharacter]],
i = ToExpression /@ Characters[i];
i[[2 ;; ;; 2]] *= 3;
Mod[Total[i], 10] == 0
,
False
]
]
ValidISBNQ["978-1734314502"]
ValidISBNQ["978-1734314509"]
ValidISBNQ["978-1788399081"]
ValidISBNQ["978-1788399083"]