英语翻译1.bar codes also help shops with re-ordering.A shop's co

英语翻译
1.bar codes also help shops with re-ordering.A shop's computer recognises the whole shape of a bar code when it passes across the scanner at a shop's checkout counter.It reads the bar code and the price of the product appears on the till display.At the same time one item is deducted from the stock total.
2.Finally,the code finishes with a check digit that makes sure the bar code has been keyed in correctly.If not,the item will either not be recognised or will be shown as a totally different products