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Path: utzoo!watmath!clyde!cbatt!ihnp4!inuxc!pur-ee!uiucdcs!uiucdcsb!mcewan
From: mcewan@uiucdcsb.UUCP
Newsgroups: comp.sys.cbm
Subject: Re: C-Power bug ???
Message-ID: <164200001@uiucdcsb>
Date: Tue, 9-Dec-86 15:30:00 EST
Article-I.D.: uiucdcsb.164200001
Posted: Tue Dec  9 15:30:00 1986
Date-Received: Sun, 14-Dec-86 00:00:30 EST
References: <1688@i.cc.purdue.edu>
Lines: 18
Nf-ID: #R:i.cc.purdue.edu:1688:uiucdcsb:164200001:000:650
Nf-From: uiucdcsb.cs.uiuc.edu!mcewan    Dec  9 14:30:00 1986


There's another, potentially much more troublesome, error that no one seems
to have noticed:

	struct tank *pl1;	/* the sprite used in this program */
	pl1->x = 53248;  *pl1->x = 30;

Pointer pl1 isn't initialized; you need to do a malloc. The results of the
above code will be totally unpredictable. It could overwrite the running
code and cause a crash in some other routine. It may not cause any problem
at all. Since it depends on what junk is sitting in memory when the program
is run, you could get different results when you run the program different
times.

		Scott McEwan
		{ihnp4,pur-ee}!uiucdcs!mcewan

"Sheep abusers really get my goat."