Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!ntvaxb!larry
From: larry@vaxb.acs.unt.edu
Newsgroups: comp.lang.c++
Subject: turbo C++/malloc probelm
Message-ID: <32729.26d49b87@vaxb.acs.unt.edu>
Date: 24 Aug 90 03:14:15 GMT
Lines: 37

I am using turbo c++ to write a game and I have run in to the following
problem.  I noticed that the values of one of the arrays I am using in my
program were wrong for no obvious reason.  Using the debugger, I stepped
through the program, and found that the changes occured during a malloc.

The code looks something like this.

.
 [code omited]
.
int segarr[11][7];
.
.
.
void *p0;
void *p1;
void *p2;
unsigned int size;
.
.
.
size = imagesize(0,0,20,20);
p0 = malloc(size);

the segarr values change as soon as the malloc executes.  After close
inspection with the debugger, I noticed that the address of p0 was inside
segarr.  The problem is obvious, the solution is not.  Oh, one other thing, the
pointers p0,p1, and p2, are part of a class.

Later........Larry

================================================================================
Larry Michalewicz             Bitnet : LARRY@UNTVAX 
VAX Operator/Programmer       THENET : NTVAXA::LARRY
(and student of CSCI at)    Internet : LARRY@VAXB.ACS.UNT.EDU
The University of North Texas   SPAN : UTSPAN::UTADNX::NTVAXA::LARRY
================================================================================