fflush---flush buffered file output#include <stdio.h> int fflush(FILE *fp);
Description
The stdio output functions can buffer output before delivering it
to the host system, in order to minimize the overhead of system calls.
Use fflush to deliver any such pending output (for the file
or stream identified by fp) to the host system.
If fp is NULL, fflush delivers pending output from all
open files.
Returns
fflush returns 0 unless it encounters a write error; in that
situation, it returns EOF.
Portability
ANSI C requires fflush.
No supporting OS subroutines are required.
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