走进超市,细心的同学会发现:在精美的商品包装盒(袋)上,都印有一个小长方形,上面有粗细不一的竖条形,竖条形下面有与其对应着的阿拉伯数字,这就是商品条形码.条形码的主要作用是帮助营业员快速结帐,因为条形码与商品是一一对应的,通俗的说条形码就是商品的身份证. Into the supermarket, the attentive classmates will find that: On the exquisite packaging box (bag), there is a small rectangle printed on it, with vertical bars of different thicknesses. Below the vertical bars, there are corresponding Arabic numerals. This is the product bar code. The main function of the bar code is to help the salesperson to quickly check out, because the bar code and the goods are one-to-one correspondence, the popular bar code is the identity of the goods.