A check digit is a form of redundancy check used for error detection, the decimal equivalent of a binary checksum. It consists of a single digit computed from the other digits in the message. With a check digit, one can detect simple errors in the input of a series of digits, such as a single mistyped digit or some permutations of two successive digits.
Barcode Value: X1 X2 X3 X4 X5 X6 X7 X8 X9 X10 X11 X12
Step-1: Add the digits in the odd-numbered positions. ( X2 + X4 + X6 + X8 + X10 + X12)
Step-2: Value from the value in step 1 multiplied by 3
Step-3: Add the digits in the even-numbered positions. ( X1 + X3 + X5 + X7 + X9 + X11)
Step-4: As a result of the 2 nd and 3 rd step is collected as a result of the step.
Step-5: Value is subtracted from the number in step 4 of Article 10.
Note: 5 th step, the value is the value of the check digit.
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