Solved

Trees on the brain

Posted on 1998-02-11
3
199 Views
Last Modified: 2010-04-16
I need to write a procedure to build a binary tree using arrays where the data item is string[10]. I also need a procedure to build a binary tree  using pointers where the data item is string[10]. Any suggestions / algorithms?
0
Comment
Question by:chadd082197
3 Comments
 
LVL 5

Expert Comment

by:inter
ID: 1217276
I do not understand the bintree with arrays but with pointers here is the idea:

type
  PNode = ^TNode;
  TNode = record
   data : string[10];
   L,R  : PNode; // left and right childs of node
  end;

var
  Root : TNode; //the root node for our tree

Now, please list what methods you want for this tree. e.g. adding item, removing item, balancing the tree etc...

Igor
0
 
LVL 2

Expert Comment

by:mitchell042997
ID: 1217277
You can use an array if you plan on having a balanced tree.  For example, if you want the tree:

....1
.../.\
..2...3
./\.../\
4.5..6..7

Then you can have an array like this:

1 | 2 | 3 | 4 | 5 | 6 | 7

To find any node's left child, multiply it by 2.  To find it's right child, multiply it by two and add 1.  If you have an unchanging, balaced array that you need to perform a lot of searches on, this way is quicker than using pointers.


0
 
LVL 1

Accepted Solution

by:
santhosh022698 earned 100 total points
ID: 1217278
binary tree using pointers :
type node = ^item ; item = record  data : string[10]; l,r : node; end;
the function for insertion is
function insert (root : node, toinsert : string):node ;
begin  if root=nil then begin root^.data := toinsert ; root^.l := nil; root^.r := nil; end
else if root^.data > toinsert then root^.left := insert(root^.left, toinsert)
else root^.right := insert (root^.right, toinsert);
insert := root ; end ;
0

Featured Post

How to run any project with ease

Manage projects of all sizes how you want. Great for personal to-do lists, project milestones, team priorities and launch plans.
- Combine task lists, docs, spreadsheets, and chat in one
- View and edit from mobile/offline
- Cut down on emails

Join & Write a Comment

Moving applications to the cloud or switching services to cloud-based ones, is a stressful job.  Here's how you can make it easier.
We have come a long way with backup and data protection — from backing up to floppies, external drives, CDs, Blu-ray, flash drives, SSD drives, and now to the cloud.
In this seventh video of the Xpdf series, we discuss and demonstrate the PDFfonts utility, which lists all the fonts used in a PDF file. It does this via a command line interface, making it suitable for use in programs, scripts, batch files — any pl…
Get a first impression of how PRTG looks and learn how it works.   This video is a short introduction to PRTG, as an initial overview or as a quick start for new PRTG users.

758 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

17 Experts available now in Live!

Get 1:1 Help Now