球与楼梯
........\123.cpp
........\123.dsp
........\123.dsw
........\123.ncb
........\123.opt
........\123.plg
........\Debug
........\.....\123.exe
........\.....\123.ilk
........\.....\123.obj
........\.....\123.pch
........\.....\123.pdb
........\.....\vc60.idb
........\.....\vc60.pdb