According to ISO-2 108, the parity bit generation is calculated by the coefficient 1 1. The calculation method is to multiply the first nine digits of ISBN by numbers from 10 to 2 in turn, add the products, and divide the sum by11; If there is no remainder, the check number is "0"; If there is a remainder, subtract it from 1 1 and the difference is the check number. If the difference is 10, it is represented by an "x" representing the Roman numeral 10.
ISBN is used in textbooks, printed matter, micro-reproduction, educational television or movies, mixed media publications, microcomputer software, atlases and maps, Braille publications and electronic publications.
The first part of China Standard Book Number (ISBN) is the main part of this numbering system and can be used independently. It consists of 13 digits, separated by a hyphen "-",and is divided into four parts, which respectively represent the group number, publisher number, book number and parity bit. The lengths of the other three segments are variable, except that the parity bit is fixed at one bit, but the sum of the digits of these three segments must be nine bits, and a parity bit is added, so that the digits of the serial number length 1SBN are always equal to 10. When the parity bit is 10, it is represented by the capital letter "X", and when the parity bit is 1 1, it is represented by "O".
For the publishing industry, the use of Chinese standard book number is not only helpful to the management of book publishing, distribution, statistics and inventory control, but also more convenient for the international exchange of publications; For data units such as libraries, the procurement, collection, cataloging, circulation and interlibrary loan can be simplified.
References:
Baidu encyclopedia-international standard book number