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Synopsis:
    #include <stdio.h>
    int fflush( FILE *fp );

Description:
    If the file fp is open for output or update, the fflush function causes
    any unwritten data to be written to the file.  If the file fp is open
    for input or update, the fflush function undoes the effect of any
    preceding  ungetc operation on the stream.  If the value of fp is NULL,
    then all files that are open will be flushed.

Returns:
    The fflush function returns non-zero if a write error occurs and zero
    otherwise.  When an error has occurred,  errno contains a value
    indicating the type of error that has been detected.

See Also:
    fgetc, fgets, flushall, fopen, getc, gets, setbuf, setvbuf, ungetc

Example:
    #include <stdio.h>
    #include <conio.h>

    void main()
      {
        printf( "Press any key to continue..." );
        fflush( stdout );
        getch();
      }

Classification:
    ANSI

Systems:
    All