编制全屏幕文本编辑器。要求至少具备文字的增、删、改功能，光标可以上下左右移动，能前后翻屏，能删除行，能将文字保存到磁盘或从磁盘装入内存。-The preparation of full-screen text editor. Requires at least have the text, delete, change the function, the cursor can be moved up and down, to scroll off the front and rear, to r