The International Standard Book Number (ISBN) has an inbuilt validity check. An alternative checking algorithm to that defined by the Standard Book Numbering Agency is presented. The alternative algorithm is demonstrated to pro duce identical results and is marginally more efficient.
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References
1.
International Standard Book Numbering (The Standard Book Numbering Agency Ltd., London, 1972).
2.
P. Brophy, COBOL Programming (Bingley, London , 1976).
