From:	"Maan M. Hamze" <mmhamze AT mail DOT utexas DOT edu>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Pointers, arrays and assignments
Date:	15 Dec 1996 08:19:30 GMT
Organization:	University of Texas at Austin
Lines:	25
Message-ID:	<01bbea60$9331e020$23705380@maan-m.-hamze>
References:	<32B3AA6F DOT 1302 AT synapse DOT net>
NNTP-Posting-Host:	slip-36-3.ots.utexas.edu
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

Bill Lachance <billl AT synapse DOT net> wrote in article
<32B3AA6F DOT 1302 AT synapse DOT net>...
>But when I try a stunt like:
> plyr[0]->X=4960, the program crashes abruptly (I've isolated the
> problem).
> 
> Am I breaking some unknown rule here?
> 
Hi Bill
I am no professional on pointers but I know this much:
You are not setting your pointer to an address before dereferencing it.
Let me quote from Stephen Prata's book "C++ Primer Plus" (pub by Waite
Group):
Pointer Golden Rule:  ALWAYS set a pointer to a definite and appropriate
address before applying the
dereferencing operator (*) to it.(page 127).
You may want to check Chapter Four "Derived Types" in Prata's book on
pointers and his golden rules.
Or check Chapter 8 on Pointers in the new book from Waite Group by Robert
Lafore:  C++ Interactive Course.
Maan
-- 
Maan M. Hamze
mmhamze AT mail DOT utexas DOT edu
http://leb.net/~mmhamze

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