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Characters that are written to a stream are normally accumulated and transmitted asynchronously to the file in a block, instead of appearing as soon as they are output by the application program. Flushing output on a buffered stream means transmitting all accumulated characters. There are many circumstances when buffered output on a stream is flushed automatically:

  • When you try to do output and the output buffer is full.
  • When the stream is closed.
  • When the program terminates by calling exit.
  • When a newline is written, if the stream is line buffered.

If you want to flush the buffered output at another time, call fflush, which is declared in the header file stdio.h.


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