Use io manipulator ‘unitbuf’ to turn off stream buffering and ‘nounitbuf’ to turn on stream buffering. If ‘unitbuf’ is on the stream object is flushed after every insertion else the stream is not force flushed. For e.g. endl triggers a flush in cases of ‘nounitbuf’.
fstream fstr( “c://Hello.txt” );
[sourcecode language=”cpp”]cout << unitbuf << "Buffering turned off";
cout << nounitbuf << "Buffering turned on";[/sourcecode]
Also note that ‘endl’ flushes stream buffer along with inserting a new line character.