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CalcISBNCheckDigit function
See also
Unit
EanKod
Declaration
function CalcISBNCheckDigit(s: String): Char;
Description
It calculates the check sum for ISBN, ISSN and ISMN codes. The code must be 9 digits long( eventually also 2 or 5 add-on digits. It does not contain prefix(978,977 or 979). It can contain a format code then it can contain characters _, e.g. 123-456-789