一个简单的控制台C++餐馆收银系统，用户权限共有三种。服务生可以点菜，查看自己的销售。收银员可以结账，查看全局销售。经理可以增加或修改权限，并且修改菜单和桌位。-A simple console C++ restaurant cash register system, there are three user rights. Ready to order the waiter to see their sales. Cashier can check out to see the global