语句ofstream f("SALARY. DAT", ios: :app | ios: :binary) ;的功能是建立流对象f，试图打开文件SALARY.DAT并与之连接，并且

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语句ofstreamfSALARY．DATios::app｜ios::binary的功能是建立流对象

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语句ofstream f("SALARY. DAT", ios: :app | ios: :binary) ;的功能是建立流对象f，试图打开文件SALARY.DAT并与之连接，并且

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