设计要求：设计一个自动售货机控制系统。该系统能完成对货物信息的存储、进程控制、硬币处理、余额计算、显示灯功能。可以管理4种货物，每种货物的数量和单价在初始化时输入，在存储器中存储。用户可以用硬币进行购物，按键进行货物选择；售货时能根据用户输入的货币，判断钱币是否足够，钱币足够则根据顾客要求自动售货，钱币不足则给出提示并推出；能够自动计算出应找钱币余额、库存数量并显示。-Design requirements: design of a vending machine. The system can complete the storage of goods, information, process control, coin handling, balance calculations, the LED functions. 4 kinds of goods can be managed, and the unit price of each quantity of goods entered at the initialization, the memory storage. Users can make purchases with a coin, button selection of goods　sales when the currency based on user input to determine whether enough money, enough money is auto sales according to customer requirements, less money is given prompt and launch　able to automatically calculate the balance should be looking for money, stocks and displayed.