Thread View: alt.comp.borland-delphi
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Started by Nige
Tue, 06 Dec 2005 23:38
Help a newbie
Author: Nige
Date: Tue, 06 Dec 2005 23:38
Date: Tue, 06 Dec 2005 23:38
9 lines
1452 bytes
1452 bytes
Looking at some sample code. I have a line, which calls a function and the 3rd parameter is @Cells^[0] whats do the @ and the ^ and the [0] indicate. thanks
Re: Help a newbie
Author: Nicholas Sherlock
Date: Tue, 06 Dec 2005 23:55
Date: Tue, 06 Dec 2005 23:55
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Nige wrote: > @Cells^[0] > > whats do the @ and the ^ and the [0] indicate. The whole thing gives you the address of (@) the fist item ([0]) of the memory that cells uses (^). Read some tutorials on pointers. Cheers, Nicholas Sherlock
Re: Help a newbie
Author: Jamie
Date: Wed, 07 Dec 2005 04:06
Date: Wed, 07 Dec 2005 04:06
37 lines
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Nige wrote:
> Looking at some sample code.
>
> I have a line, which calls a function
>
> and the 3rd parameter is @Cells^[0]
>
> whats do the @ and the ^ and the [0] indicate.
>
> thanks
>
>
The @ generates an address of an item.
so lets break this down.
Cells is being treated like a pointer and
thus the use of ^ meaning that you are
fetching data via the pointer which is like
a road map giving directions of where the
start of the data which makes up the object
"CELLS" resides in.
Since it's obvious that Cells must not
be a pointer already to start with, using the
@ infront will generate a pointer address of that
object.
and the use of the [0] is like any other
array from that point on.
it will simply use the Pointer address as the
starting base with the an offset of what
ever in the [?] to calculate the distant to
move from the start of the pointer.
--
Real Programmers Do things like this.
http://webpages.charter.net/jamie_5
Re: Help a newbie
Author: Bruce Roberts
Date: Wed, 07 Dec 2005 15:13
Date: Wed, 07 Dec 2005 15:13
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"Nige" <nkarnold@blueyonder.co.uk> wrote in message news:Ihplf.160032$Es4.143191@fe2.news.blueyonder.co.uk... > Looking at some sample code. > > I have a line, which calls a function > > and the 3rd parameter is @Cells^[0] > > whats do the @ and the ^ and the [0] indicate. The code won't compile. In any case it is nonsensical. @Cells and Cells mean the same thing as does Cells^ and Cells, presuming Cells is the name of an array.
Re: Help a newbie
Author: DrChaos
Date: Thu, 15 Dec 2005 17:09
Date: Thu, 15 Dec 2005 17:09
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Nige wrote: > Looking at some sample code. > > I have a line, which calls a function > > and the 3rd parameter is @Cells^[0] > > whats do the @ and the ^ and the [0] indicate. > > thanks > > @ = adress of ^ dereferences a pointer [x] is the x'th position in a list or array.
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