多功能文档编辑器

说明：  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(copy),中英文转换t(language)等功能
(this program is to achieve c multifunctional text editors, it can be achieved apart from the general text editing functions, has also increased the preservation of a document (save), converted to uppercase m (large), with lowercase k (small), copy of the j (copy), t conversion English (language) function)