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──The Microsoft iostream Classes────────────────────────────────────────────
 
  static void sync_with_stdio();
 
  Remarks
 
  Synchronizes the C++ streams with the standard I/O system. The first
  time this function is called, it resets the predefined streams (cin,
  cout, cerr, clog) to use a stdiobuf object rather than a filebuf object.
  After that, I/O using these streams can be freely mixed with I/O using
  stdin, stdout, and stderr. Some performance decrease will result because
  there is buffering both in the stream class and in the standard I/O file
  system.
 
  After the call to sync_with_stdio, the ios::stdio bit is set for all
  affected predefined stream objects, and cout is set to unit buffered
  mode.
 
 
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