----- Original Message -----
From: Also-Antal Csaba <antalcs@MAIL.MATAV.HU>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Tuesday, February 26, 2002 3:30 PM
Subject: Re: [pic]:struct+pointer


> Sergio Masci wrote:
> >
> > > > cost ship * p;
> >
> > is this cost actually const?
> >
> > You can read from but not write to a const location.
> > const meens constant, unchanging. Declaring a const
> > pointer meens that it points to something which must
> > not be changed.
> >
> > > > p=&ship1;
> > > > (*p).temperature=123;
> > > > the error message is same.
>
> The p pointer is const, but the &ship1 expression is the address of the
> ship1 variable. (*p).temperature=123; is point to the ship1.temperature
> varible. So the ship1.temperature=123; and (*p).temperature=123; is must
> be equal. When i read from work, when write not, this looks like a bug.

no the pointer is not const, it is a pointer to a const.

to get a const pointer you would write:

ship * const p;

Regards
Sergio

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