ISBN Program

[Mark Young]

Hello,

I am having some problem on this program. I have to write up an ISBN program but I don't know what am I supposed to do. The numbers on the back on the book is the ISBN. I have to punch it in and it supposed to tell me if the number is correct or not. What code can do that and can you show me how. THanks!


Mark Young

[James Curran]

If I recall correctly, if you add be each digit of an ISBN, the total should be a multiple of 11 (if the last digit is an "X", count that as a 10). Otherwise, is should follow the format:
1 digit: Language (0=English)
dash
some digits: ID # of publisher (assigned by ISBN committee)
dash
some digits: ID # for that book (assigned by publisher)
dash
1 digit (or "X"): Check digit as described above.


Truth,
James
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