Each book has only one ISBN number. ISBN can be used to identify the same book. If there is only one such book, then ISBN can be used to identify this book.

Different versions of the same book have different ISBN numbers.

The full name of ISBN is the International Standard Book Number, which is an international number specially designed for identifying books and other documents. Starting from 65438+2007 1 October1,a new ISBN was implemented, consisting of 13 bits and divided into five segments. ISBN can be used as the retrieval field of online bibliography, thus adding a retrieval way for users.

Extended data:

Meaning of ISBN paragraph:

ISBN number consists of 13 digits, separated by four connecting digits or four spaces, and each group of digits has a fixed meaning.

1. The first group is 978 or 979;

2. The second group is the country, language or location code;

3. The third group is the publishing house code (distributed to publishing houses by ISBN distribution centers in various countries or regions);

4. The fourth group is the book sequence code (the publishing code is given by the publishing house);

5. The fifth group is the check code (only one bit, from 0 to 9):

Check code algorithm:

Suppose the first nine digits of an international standard book number are: 7-309-04547.

Calculate the weighted sum s: s = 7×10+3× 9+0× 8+9× 7+0× 6+4× 5+5× 4+4× 3+7× 2 = 226;

Calculate the remainder of S÷ 1 1 m: m = 226 mod11= 6; Calculate the difference of 1 1-M n: n = 1 1? 6=5 If N= 10, the check code is the letter "X"; If N= 1 1, the check code is the number "0"; If n is another number, the check code is the number n, so the check code of this book is 5, so the international standard book number is ISBN 7-309-04547-5.

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