It consists of 10 digits, and these l0 digits consist of four parts: group number, publisher number, book title and inspection number, which are connected by "-". The check code is the last digit of the ISBN number, which can verify whether the ISBN number is correct, that is, multiply the digits of 1- 9 of ISBN by 10- in turn. If it can be divisible by 1 1, the ISBN number is correct, and the check number can only be 1 bit. When it is 10, it is recorded as Roman numeral X.
For example: ISBN 7- 5233- 3536-9, manual calculation:
7 *10+5 * 9+2 * 8+3 * 7+3 * 6+3 * 5+5 * 4+3 * 3+2 * 6 = 226, plus check digit 9, (226+9)/1/kloc-
(2) The verification method of ISBN number of13 is different.
Example: ISBN 978-0-393-04002-9 has a prefix of 978 (for books), the middle part is the same as ISBN, and the last digit is the check code. The weighting algorithm of parity bit is different from that of l0 bit ISBN. The specific algorithm is: the odd number before ISBN 12 is multiplied by 1, and the even number is multiplied by 3. The sum of the products is modulo 10, and the difference between 10 and modulo 10 (that is, the number of bits of each bit is taken) to obtain the value of the parity bit, and its value range should be 0~9.
Verify that ISBN 978-0-393-04002-9 is correct.
Total location12345 678 91110213.
ISBN 9 7 8 0 3 9 3 0 4 0 0 2 9
Weight1313131313.
The sum of the product 9 2 1 8 0 3 27 3 0 4 0 0 6 is 8 1, and the parity bit is 9, which is correct. Example: Flying Dreams is written by Chen Feng, ISBN: 7-80595-219-1/i.132, CIPNo.: 2002225 18.
In fact, the number of digits in the kernel font is wrong. Before 2 00 0, it was 9 digits. In 2000, 9 digits coexisted with 10 digits. After 2000, it was 10 digits. Judging from this, this book is pirated. (1) Retrieves the font size approved by CIP.
Through the query of CIP core font size, the authenticity and reflected content of CIP data can be verified.
The inquiry website is CIP Center of China Press and Publication Information Network. See further reading for the website.
After entering the website, find the place that says "CIP verification":
① Enter the complete nuclear font size to be queried, in the format of Year Number+Nuclear Serial Number. For example: Hezi (2005)No. 123456, and the complete nuclear font size is "2005 123456".
② Click the "Verify" button.
③ Display the information of hitting CIP data.
Example: Let there be light, enchanting, elegance and harmony, a collection of poems, Xiyuan Publishing House. According to the CIP No.2003023847 in the book, I found another book with the original title: Course of ERP Principles and Applications, with the classification number of F270.7, and the first author: Chen Zhuang, Yang, and Edition: 1
Press: Electronic Industry Press. Publication date: April 2003. Place of publication: Beijing.
(2)CIP data retrieval
You can search by the combination of book title, publishing house and ISBN, but generally speaking, it is enough to search directly with ISBN.