编写商品销售统计程序，商品的信息有商品的名称、计算单位（重量或件）、单价。所有商品的信息事先存入计算机，屏幕上显示所有的名称，选择商品名，输入商品计量单位（如重量、件数等），根据单价算出总价。客户一次购物可能购买多种商品，程序应计算出客户应付的钱款数。-Prepare sales statistics program, commodity information goods name, unit, unit price (weight or piece). All products information previously stored in a computer, all in the name of the display screen, select the commodity name, input commodity unit of measurement (such as weight, number of items), according to the unit price calculated price. The customer may buy a shopping goods, program should calculate the money payable by customers of the number.