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ISBN\ Check Digit for International Standard Book Number {#isbn-check-digit-for-international-standard-book-number align=”center”} ==================================================

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ISBN is a C++ library which can compute the check digit for an International Standard Book Number (ISBN), or report whether a given ISBN is valid.

Licensing: {#licensing align=”center”}

The computer code and data files made available on this web page are distributed under the GNU LGPL license.

Languages: {#languages align=”center”}

ISBN is available in a C version and a C++ version and a FORTRAN90 version and a MATLAB version and a Python version.

Related Data and Programs: {#related-data-and-programs align=”center”}

BANK, a C++ library which can compute the check digit associated with a US Bank Routing Number check digit, or it can report whether a 9-digit code is actually valid.

LUHN, a C++ program which computes the Luhn check digit for a string, and can validate a string.

UPC, a C++ library which can determine the check digit for a Uniform Product Code (UPC) or report whether a given UPC is valid.

Reference: {#reference align=”center”}

Source Code: {#source-code align=”center”}

• isbn.cpp, the source code.
• isbn.hpp, the source code.

Examples and Tests: {#examples-and-tests align=”center”}

• isbn_prb.cpp, a sample calling program.
• isbn_prb_output.txt, the output file.

List of Routines: {#list-of-routines align=”center”}

• CH_IS_DIGIT is TRUE if a character is a decimal digit.
• CH_TO_DIGIT returns the value of a base 10 digit.
• I4_TO_ISBN converts an I4 to an ISBN digit.
• I4VEC_PRINT prints an I4VEC.
• ISBN_CHECK_DIGIT_CALCULATE determines the check digit for an ISBN.
• ISBN_IS_VALID reports whether an ISBN is valid.
• ISBN_TO_I4 converts an ISBN character into an integer.
• S_TO_DIGITS extracts N digits from a string.
• TIMESTAMP prints the current YMDHMS date as a time stamp.

You can go up one level to the C++ source codes.

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Last revised on 14 September 2015.