杨辉三角形
..........\2_8.cpp
..........\2_8.dsp
..........\2_8.dsw
..........\2_8.ncb
..........\2_8.opt
..........\2_8.plg
..........\Debug
..........\.....\2_8.exe
..........\.....\2_8.ilk
..........\.....\2_8.obj
..........\.....\2_8.pch
..........\.....\2_8.pdb
..........\.....\vc60.idb
..........\.....\vc60.pdb