二维概率
........\a.fil
........\Debug
........\.....\two.exe
........\.....\two.ilk
........\.....\two.obj
........\.....\vc60.idb
........\.....\vc60.pdb
........\two.cpp
........\two.dsp
........\two.dsw
........\two.ncb
........\two.opt
........\two.plg