File I/O Basics

• A file has two names

• The external file name which is used by the operating system and the programmer

  • infile.dat and outfile.dat

• The stream name which is used by the program to access and manipulate the file

  • in_stream and out_stream

• The external name is typically used only once (as the argument to the function open)

• After the file is opened the file is always referred to by naming the stream that is connected to the file

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