Computer Science for IGCSE & O level - Hardware (Section 15 - No. 36)
In the barcode system, what happens when the stock record is updated?
The price of the item is increased.
The key field is updated.
The number of stock items in the record is reduced by 1.
A new barcode is generated.
Vysvetlenie
Each time the barcode is scanned, the item number decreases.