用键盘控制的圆环
................\1
................\.\1.cpp
................\.\1.dsp
................\.\1.dsw
................\.\1.ncb
................\.\1.opt
................\.\1.plg
................\.\Debug
................\.\.....\1.exe
................\.\.....\1.ilk
................\.\.....\1.obj
................\.\.....\1.pch
................\.\.....\1.pdb
................\.\.....\vc60.idb
................\.\.....\vc60.pdb