求角度\1.cpp
......\1.dsp
......\1.dsw
......\1.ncb
......\1.opt
......\1.plg
......\2.cpp
......\2.dsp
......\2.dsw
......\2.ncb
......\2.opt
......\2.plg
......\Debug\1.exe
......\.....\1.ilk
......\.....\1.obj
......\.....\1.pch
......\.....\1.pdb
......\.....\2.exe
......\.....\2.ilk
......\.....\2.obj
......\.....\2.pch
......\.....\2.pdb
......\.....\vc60.idb
......\.....\vc60.pdb
......\Debug
求角度