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Guanta tells the right cause.
However, personally I would discourage the use of C++ streams. Mostly because these can be quite unreadable and most important these are not thread-safe in multi-threaded enviroments. That is, your program may crash spuriously because their internal state may get corrupted.
See also http://google-styleguide.googlecode.com/svn/trunk/cppguide.xml?showone=Streams#Streams and http://stackoverflow.com/questions/5328873/c-streams-vs-c-style-io
