Bill Patterson wrote in a message to Thomas Seeling:

 TS>  TS>> fflush() is only defined for output streams.

 TS>  BP> I meant fflush(stdin)

 TS> You meant wrong, then.

 BP> According to my instructor at the college and SAM's
 BP> "Programming in ANSI C" page 457, I meant right.

Both your instructor and this book are wrong.  As many people here have
been trying to convince you, the actual wording of Section 7.9.5.2 of the
ANSI C standard explicitly says that fflush() is defined only for output
streams:

   int fflush(FILE *stream);

   If 'stream' points to an output stream or an update stream in which the 
   most recent operation was not input, the 'fflush' function causes any 
   unwritten data to be delivered to the host environment to be written to a 
   file; otherwise, the behavior is undefined.
 
-- Mike


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