Computer Science: A Structured Programming Approach Using C, Third Edition
3rd Edition
ISBN: 9780534491321
Author: Behrouz A. Forouzan, Richard F. Gilberg
Publisher: Course Technology, Inc.
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Chapter 8, Problem 31PS
An international standard book number (ISBN) is used to uniquely identify a book. It is made of 10 digits, as shown in Figure 8-44. Write a function that tests an ISBN to see if it is valid. For an ISBN number to be valid, the weighted sum of the 10 digits must be evenly divisible by 11. The tenth digit may be x, which indicates 10.
To determine the weighted sum, the value of each position is multiplied by its relative position, starting from the right, and the sum of the products is determined. The calculation of the weighted sum for the ISBN shown above is demonstrated in Table 8-5.
Since the weighted sum modulus 11 is 0, the ISBN number is valid. Test your function with the above example, the ISBN number for this text (see the copyright page), and 0-08-781809-5 (an invalid ISBN—the third and fourth digits are reversed).
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