ISBN
Check Digit for International Standard Book Number

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

Licensing:

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

Languages:

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:

BANK, a MATLAB 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.

isbn_test

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

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

Source Code:

• ch_is_digit.m, is TRUE if a character is a decimal digit.
• ch_is_digit_test.m
• ch_is_isbn_digit.m, is TRUE if a character is an ISBN digit.
• ch_is_isbn_digit_test.m
• ch_to_digit.m, returns the value of a base 10 digit.
• ch_to_digit_test.m
• i4_to_isbn_digit.m, converts an I4 to an ISBN digit.
• i4_to_isbn_digit_test.m
• i4vec_print.m, prints an I4VEC.
• i4vec_print_test.m
• isbn_check_digit_calculate.m, determines the check digit for an ISBN.
• isbn_check_digit_calculate_test.m
• isbn_digit_to_i4.m, converts an ISBN character into an integer.
• isbn_digit_to_i4_test.m
• isbn_is_valid.m, reports whether an ISBN is valid.
• isbn_is_valid_test.m
• s_to_digits.m, extracts N digits from a string.
• s_to_digits_test.m
• s_to_isbn_digits.m, extracts N ISBN digits from a string.
• s_to_isbn_digits_test.m
• timestamp.m, prints the current YMDHMS date as a time stamp.