A sales clerk enters a customer's six-number customer account.The computer program uses the first five numbers to calculate a sixth number.This resulting number is then compared to the sixth number entered by the sales clerk.This is an example of a
A)a valid character test.
B)missing data test.
C)reasonableness test.
D)check digit.

Question

Quizplus · Accepted Answer

This is an example of a check digit. A check digit is a form of validation that involves adding an extra digit or number to a code or identifier to ensure accuracy and detect errors. It is commonly used in barcodes, credit card numbers, and customer account numbers, among others. The check digit is calculated using a specific algorithm, and it can be used to verify whether the code or identifier entered by the user is valid or not. In this case, the computer program uses the first five numbers to calculate a sixth number (check digit), which is then compared to the sixth number entered by the sales clerk to ensure accuracy and prevent errors.

A Sales Clerk Enters a Customer's Six-Number Customer Account