很简单的文本编辑器

说明：  我们这学期新开的c语言这门课，自己试着编了这么一个简单的程序。希望大家不吝赐教，也能多给我们初学者指明一个方向。谢谢。
(we opened the new semester c language this course, try to figure compiled such a simple procedure. We hope that the wing can also give us a direction specified beginners. Thank you.)