Message-ID: <3373626C.70F7@mailbox.swipnet.se>
Date: Tue, 13 May 1997 22:44:12 -2000
From: Krystyna de Heras <krystyna DOT de DOT heras AT mailbox DOT swipnet DOT se>
MIME-Version: 1.0
To: djgpp AT delorie DOT com
Subject: Re: HELP! Pointers and structs
References: <33734562 DOT 2756 AT mailbox DOT swipnet DOT se>
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Krystyna de Heras wrote:
> 
> Hi all!
> 
> I have been coding in C++ for soon four days and while I am porting some
> Pascal code I had this idea of optimizing things a little bit also.
> 
> The problem is this: Incrementing pointers in a structure.
> 
> In my thick C++ book it says.
> 
> type *variable=new type[n];
> variable[a]=2; <=> *(variable+a)=2;
> 
> So I began to think. Let's say we have this structure:
> 
> typedef struct clowntype
> {
>  unsigned long int amount_of_pies, balloons;
> } clowntype;
> 
> typedef struct cirkustype
> {
>  unsigned long int amount_of_clowns, ticket_cost;
>  clowntype *clowns;
> } cirkustype;
> 
> main bla bla
> 
> cirkustype *cirkus_max= new cirkustype;
> 
> ok here is something I don't know if it's legal
> but it compiles allright.
> 
> clowntype *leasing= new clowntype[5];
> cirkus_max->clowns=leasing; // Clowns Points at same as adress as
> leasing.
> 
> Now for the problem.
> leasing[10].amount_of_pies=12;
> THIS WON'T COMPILE
> cirkus_max->(*(clowns+10)).amount_of_pies=12;
> THIs will compile
> cirkus_max->clowns=cirkus_max->clowns+10;
> cirkus_max->clowns->amount_of_pies=12;
> 
> Is there a way of indexing clowns without changing its value?

Hey I came a up with the answer myself.

cirkus_max->clowns=new clowntype[1000];
indexing like this
cirkus_max->clowns[666].amount_of_pies=69;

If you've read this I'm sorry if it didn't give you any more insight to
your massive intelligences, and high iq's ;)

NO flames thank you....

Sincerely / Pablo de Heras

Hey go here to the download section
  http://www.efd.lth.se/~d96pd/dl.html