this procedure designed vending machine sales only two canned cola, both at 15 y...

代码说明：

此程序设计的自动售货机只销售两种罐装可乐，售价均为15元。顾客可以由两个不同投币孔分别投入3个五元硬币或2个10元硬币。一次交易只能买一罐，且自动找零。只要按下取消键就会马上无条件退币。-this procedure designed vending machine sales only two canned cola, both at 15 yuan. Customers can from two different coin Kong spent three five yuan coins or two ten-dollar coins. A transaction can only buy and Automation Change. As pressing a button will be abolished immediately and unconditionally coin.