Computer Science for IGCSE & O level - Algorithm Design And Problem Solving (Section 2 - No. 44)
What is the primary purpose of a check digit in a barcode?
To increase the storage capacity of the barcode
To ensure the barcode is readable by all scanners
To detect data entry errors
To encode the product's price
Explication
Check digits are used to detect errors, such as incorrect digit entered, during data entry.