说明：  此程序在红帽系统下编写，里边主要用到了指针、结构体、文件操作等知识，编写的宗旨是对是结构体与指针知识的一个巩固，当然里边还用到了很多文件操作相关知识，能够使我们更加熟悉那几个常用的操作函数。代码不长，适合新手入门。。
(This program written in Redhat5.5 system, which mainly use the pointer, structure, file operations...such as knowledge, The aim of the writing is to learn the consolidated and pointer knowledge. Of course, it also include a lot of file operations related knowledge ,it can make us more familiar with the operation of several commonly used functions.This code is not too long,so it s suitable for our beginners entry.)