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   Streams

   Discussion
   The  purpose of stream classes is to provide for the input and  output
   of  objects  of both user defined, and built-in types.  Stream  output
   produces  from such objects, sequences of characters  which  represent
   the  state  of  the object in whatever way  is  appropriate  for  that
   object. Stream input takes a sequence of characters and converts  them
   into  a form which can be incorporated within the target objects.  The
   streams of characters may or may not be transmitted to or from a file.