以字符方式读写流文件\d.dat
....................\Debug\eg87.exe
....................\.....\eg87.obj
....................\.....\eg87.pdb
....................\.....\vc60.pdb
....................\eg87.cpp
....................\eg87.dsp
....................\eg87.dsw
....................\eg87.ncb
....................\eg87.opt
....................\eg87.plg
....................\Debug
以字符方式读写流文件