Path: utzoo!attcan!uunet!lll-winken!lll-tis!helios.ee.lbl.gov!pasteur!ames!mailrus!tut.cis.ohio-state.edu!bloom-beacon!mit-eddie!bbn!gatech!rebel!didsgn!allan
From: allan@didsgn.UUCP (didsgn)
Newsgroups: comp.sources.games.bugs
Subject: Re: play.c> and a fix(?)
Summary: What about the assignment?
Keywords: spacewar, bug, play.c
Message-ID: <283@didsgn.UUCP>
Date: 15 Jun 88 15:41:44 GMT
References: <870@flatline.UUCP>
Organization: Digital Design Inc., Norcross GA
Lines: 32

In article <870@flatline.UUCP>, erict@flatline.UUCP (j eric townsend) writes:
> In play.c around line 930 or so...:
> 		for (i=0;i<3;++i) {
> 	    *       ptorp->tp_pstn[i] = ADD(pcrft->cr_pstn[i],
> 	    *       ptorp->tp_thr[i]=MUL(tmpvec[i],50.));
> 		    ptorp->tp_vel[i] = ADD(pcrft->cr_vel[i],MUL(tmpvec[i],10.));
> 		}
> 		etc.etc.
> 
> The *'d lines cause a compiler error, of course.  I'm not sure what
> the author wanted to do, so I replaced the two *'d lines with:
> 
> 	   ptorp->tp_pstn[i]=ADD(pcrft->cr_pstn[i],MUL(tmpvec[i],50.));
> 
> I know that this ignores ptorp->tp_thr[i].  Maybe it doesn't matter? :-)
> 
> What did you do to fix this?

While I still can't link (I don't have the "dbm" routines), the play.c
module does compile (I'm using Greenhills 1.8.0 Compiler on a CRDS UNOS
(SYSV) machine). Your change above removes the assignment

	ptorp->tp_thr[i]=MUL(tmpvec[i],50.)

If you change the *'d lines to the following, maybe your compiler will work.

	ptorp->tp_thr[i]=MUL(tmpvec[i],50.);
        ptorp->tp_pstn[i] = ADD(pcrft->cr_pstn[i],
        ptorp->tp_thr[i]);

-Allan G. Schrum

P.S. Does somebody have a SYSV module for the DBM stuff?