Re: what's the meaning of "car","cdr","cons" in tree's algorithm?
From: Anders Eriksson (anders.eriksson_at_morateknikutveckling.se)
Date: 04/20/04
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Date: Tue, 20 Apr 2004 11:37:46 +0200
Hello!
On Tue, 20 Apr 2004 17:06:12 +0800, hostran wrote:
<snip>
> there is "/* address of <car> */" & "/* address of <cdr> */" , but I don't
> know what's the meanning of "car" , "cdr" & "cons"?
>
Whoa, a flashback from the days when I programmed in Lisp!
You can read more about this here:
http://www.delorie.com/gnu/docs/elisp-manual-21/elisp_25.html
To summarize (since I don't know exactly how the tree is created this is my
guess): cons is a struct that contains two pointer, The first pointer is
called 'car' and points to a cons on the left side of the tree and the
second pointer is called 'cdr' and points to a cons on the right side of
the tree.
(left and right side may be switched)
// Anders
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