From:	ams AT ludd DOT luth DOT se (Martin Str|mberg)
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: What's wrong with this code snippet ?
Date:	17 Oct 1999 12:15:36 GMT
Organization:	University of Lulea, Sweden
Lines:	38
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To:	djgpp AT delorie DOT com
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Reply-To:	djgpp AT delorie DOT com

Kevin (krugman AT nospam DOT demon DOT co DOT uk) wrote:
: Hi all.
: 
: yet another dumb question, but I can't seem to spot 
: where I'm going wrong.
: 
: 
: 
: const int NUM_TILES = 320;  // This is global
: 
: int kill_list[NUM_TILES];   // This isn't
: 
: empty_kill_list(kill_list);
: 
: // Set each element of the kill list to 999
: void empty_kill_list(int *list)
: {
:   memset(list, 999, sizeof(int) * NUM_TILES);
: }
: 
: this doesn't set any of the kill list elements to 999,
: when I look at them, they appear to have been set to
: some unfeasably large negative number.
: 
: using a for loop to set the elements works fine, but is 
: probably much slower.
: 
: Any ideas ?

Yes. The second argument to memset is supposed to be in the range
0-255 (or -128 - 127). You are setting each int to "( (999 % 256) <<
24 ) + ( (999 % 256) << 16 ) + ( (999 % 256) << 8 ) + (999 % 256)"
(untested pseudo-code).


Pärt, Litany,

							MartinS

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