Description: Document the basic operations, such as a new, input and output, change the file content.
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document
........\Debug
........\.....\bsu.txt
........\.....\vc60.idb
........\.....\vc60.pdb
........\.....\第二次作业.exe
........\.....\第二次作业.ilk
........\.....\第二次作业.obj
........\.....\第二次作业.pch
........\.....\第二次作业.pdb
........\document.cpp
........\document.dsp
........\document.dsw
........\document.ncb
........\document.opt
........\document.plg