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 fflush()                Flush a Stream

 #include   <stdio.h>

 int        fflush(stream);
 FILE       *stream;                     Pointer to file structure


    fflush() flushes the contents of the buffer associated with 'stream'.
    If 'stream' is open for output, the buffer's contents are written to
    the file; if 'stream' is open for input, the buffer contents are
    cleared.  After the call, 'stream' remains open.

    Returns:    Zero if the buffer was successfully flushed, the stream
                has no buffer, or the stream is open for reading only.
                EOF is returned on error.

      Notes:    A stream that is not buffered is not affected by
                fflush().

                Flushing occurs automatically if buffers are full, the
                stream is closed, or a program terminates normally.

                fflush() negates the effect of any prior ungetc() against
                'stream'.

   -------------------------------- Example ---------------------------------

    This example opens a file, flushes the stream's buffer, then sets up
    a user-assigned buffer.

           #include <stdio.h>

           FILE *stream;
           char buf[BUFSIZ];

           main()
           {
                if ((stream = fopen("yrend.dat","r+")) != NULL) {
                    fflush(stream);
                    setbuf(stream,buf);
                  }
           }