说明：  本实验模拟ATM取款功能。本程序比较简单，但对于初学者而言，还是有有助于理解Linux的进程间通信的方法，如消息队列和共享区、管道等。程序功能上模拟了取款机上的取款.转帐.修改密码一些功能。客户端进行操作，操作记录将在服务器端显示。
(Experimental simulation of the function of ATM withdrawals. This procedure is relatively simple, but for beginners in terms of, or have help to understand the Linux inter-process communication methods, such as message queues and shared areas, such as pipelines. Procedures to simulate the functions of the teller teller machines. Transfer. Change Password features. Client operation, operational records will show the server side.)