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From: kevin@crash.cts.com (Kevin Hill)
Newsgroups: comp.sys.mac.programmer
Subject: Using Malloc to create variables.  help?
Message-ID: <6996@crash.cts.com>
Date: 17 Jan 91 09:26:04 GMT
Sender: root@crash.cts.com
Lines: 54


  All right guys, another question and this time i'll give you the whole thing,
like a function...  Here it is.
I
extern int				**track;
extern int				**map;
extern char			*bigmap;
 
 
 
function()
{
 
	int	x,y;
 
 
if ( (track = (int **)( malloc( (100 * 100) * sizeof(int) + 1) )) == NULL)
		ExitToShell();
	if ( (map = (int **)( malloc( (100 * 100) * sizeof(int) + 1 ) )) == NULL)
		ExitToShell();
	if ( (bigmap = (char *)( malloc( (100 * 100 * 32) * sizeof(char) + 1 ) )) == NULL)
		ExitToShell();
		
for (x = 0;x < 100; x++)
	for(y =0; y < 100; y++)
	{
		map[x][y] = -1;
		track[x][y] = -1;
	}
}}

there you go.  Now the problem is that when the for loops go to initialize the 
variables, it crashes with various error codes in the debugger.  Any hints,
did I declare track, map, and bigmap correctly.
  Bigmap is eventiually going to be a 100 by 100 array of icons, (the map
of my game).  Also ignore the 32 size, i'll be changing that to 128 on my
side.  Thanks.  the malloc do I need to dereference the map and track variables
before I even attempt use them?
  I.e. like (*map)[x][y] and (*track)[x][y]?  wouldn't that be the same as
defining a pointer like this
 int *pointer = ***map;
This pointer stuff is really getting wild...
  Thanks..

*******************************************************************************
*  Kevin Hill
*  San Diego State University, Accounting Major.
*  No matter where you go, there you are.
*******************************************************************************
*               \
*         *=====+)---------------------------
*               / 
*  San Diego State Fencing
*******************************************************************************