本程序是用c++实现的多功能文本编辑器，它除了可以实现一般文本的编辑功能，还增加了保存文档a(save), 转为大写m(large),改为小写k(small),复制段j-This program is achieved using c++ multi-function text editor, which can be achieved apart from the general text editing features, it has added to save the document