Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!utgpu!water!watnot!watmath!clyde!rutgers!princeton!allegra!ulysses!faline!thumper!tr
From: tr@thumper.UUCP
Newsgroups: comp.lang.c
Subject: Re: boolean function to tell if a key has been pressed
Message-ID: <523@thumper.UUCP>
Date: Fri, 20-Mar-87 08:42:30 EST
Article-I.D.: thumper.523
Posted: Fri Mar 20 08:42:30 1987
Date-Received: Sun, 22-Mar-87 16:36:31 EST
References: <10260@topaz.RUTGERS.EDU>
Lines: 40

In article <10260@topaz.RUTGERS.EDU>, whoffman@topaz.UUCP writes:
> 
> Hello,
> 
>    I am seeking a way to tell whether or not a key has been pressed on
> a keyboard. i.e something like this:
>   
>      while (1)
>      { ...statements....
>       if "a key has been pressed" {...statements}
>       ...statements...}
> 
> the problem i keep running into is that getc,getchar etc..all WAIT for
> a key to be pressed. I would just like to see IF one has been pressed.
> Any help on this would be greatly appreciated. Thanks in advance...
> 
> William R. Hoffman

Well, I gather you are using a minicomputer, so the routine I use
won't work for you.  In MS-DOS, the Microsoft and Lattice compilers
give you functions called kbkit() which take no arguments and return
either TRUE or FALSE.  Too bad because they work.

Anyway, why don't you use getchar(), check for EOF, and if there is a
character, unget() the character?  This would push it back onto the
input stream.

Tom Reingold

INTERNET:       tr@bellcore.com
--------
UUCP:
----		      watmath!clyde!bellcore\
                                ucbvax\       \
     lll-lcc\              ihnp4!mhuxt!ulysses!faline!flash!tr
      seismo!rutgers!mit-eddie!allegra/
-- 
Tom Reingold
Internet: tr@bellcore.com
Uucp: ..!allegra!ulysses!faline!flash!tr