该系统要求对一个文本文件中的内容进行各种常规操作，如：插入、删除、查找、替换等功能。通过此课题，熟练掌握文本文件的操作及用字符数组来实现字符串操作的功能-The system requirements for the contents of a text file in a variety of routine operations, such as: insert, delete, search, replace, and so on. Through this project, master the operation and use of text files to achieve the array of characters string manipulation functions