UPC
Uniform Product Code Check Digit

UPC, a MATLAB library which can compute the check digit associated with a uniform product code (UPC), or it can report whether a 12-digit UPC is actually valid.

Licensing:

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

Languages:

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

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

upc_test

Reference:

1. David Savir, George Laurer,
   The Characteristics and Decodability of the Universal Product Code,
   IBM Systems Journal,
   Volume 14, Number 1, pages 16-34, 1975.

Source Code:

• ch_is_digit.m, is TRUE if a character is a decimal digit.
• ch_to_digit.m, returns the value of a base 10 digit.
• i4vec_print.m, prints an I4VEC.
• s_to_digits.m, extracts N digits from a string.
• timestamp.m, prints the current YMDHMS date as a time stamp.
• upc_check_digit_calculate.m, returns the check digit of a UPC.
• upc_is_valid.m, reports whether a UPC is valid.