这是自己写的一个删除bak后缀文件的程序，因为有的编辑器在你修改程序后，生成一个.bak文件，如果想删除它可以看看我写的程序-This is to write a program to delete the file extension bak, because some editor, after you modify the program to generate a. Bak file, if you want to remove it to see if I can write prog