C++入门。基于类与对象的咖啡机的实现。有开关盖子、加过滤器、加咖啡、加水、进度条显示等一系列逻辑流程。-Basic C++ code. Based on the knowledge of class and object. It realize the logic of a coffee machine. Include opening/closing the lid/filter, input coffee and water, the processing bar and some ot