算术表达式
..........\Debug
..........\.....\vc60.idb
..........\.....\vc60.pdb
..........\.....\work.exe
..........\.....\work.ilk
..........\.....\work.obj
..........\.....\work.pch
..........\.....\work.pdb
..........\work.cpp
..........\work.dsp
..........\work.dsw
..........\work.ncb
..........\work.opt
..........\work.plg