🚀 go-pugleaf

In article <DGpBAs.62E@boss.cs.ohiou.edu>, deering@bobcat.ent.ohiou.edu (Paul Deering) writes:
>Hello, I am an instructor at Ohio Univsersity and teaching a C
>course for the College of Engineering and Technology. 
>I am using 2.7.0 of gcc. I am trying to fflush(stdin) 
>but it is not working properly.

fflush(stdin) is not defined by the language, and causes undefined
behaviour; the relevant quote from the comp.lang.c FAQ is:
----------------------------------------------------------------------
12.26:  How can I flush pending input so that a user's typeahead isn't
        read at the next prompt?  Will fflush(stdin) work?

A:      fflush() is defined only for output streams.  Since its
        definition of "flush" is to complete the writing of buffered
        characters (not to discard them), discarding unread input would
        not be an analogous meaning for fflush on input streams.

        There is no standard way to discard unread characters from a
        stdio input stream, nor would such a way be sufficient unread
        characters can also accumulate in other, OS-level input buffers.

        References: ANSI Sec. 4.9.5.2; ISO Sec. 7.9.5.2; H&S Sec. 15.2.
----------------------------------------------------------------------
I don't know how gcc reacts to fflush(stdin), but I definitely don't
want to use in my programs statements whose execution can cause
different behaviour with different compilers, or different versions of
the same compiler...

Maurizio Loreti                       http://mvxpd5.pd.infn.it/wwwcdf/mlo.html
Un. of Padova, Dept. of Physics - Padova, Italy          loreti@padova.infn.it