A file format for writing a tree structure into a file

Hi,
I've created a tree using VC++. i would like to write the tree structure to a text file.
Can anyone suggest me a format for writing into a file??? It should be in such a way that the tree can be easily recreated by reading from the text file....Help please.....

I'd recommend doing somethine like this.

Write each level of your tree in it's own block, seperated by newlines (if you have an empty node then fill with a question mark or something)....

For example, if you have this tree:


you could right it as:

But how will i know whether '1' is a root node or '2' is a root node??

s01: Do you want pictorial representation of your tree or as a linear array?
If B-con's example is taken, and you wanna know your root, choose any ordering of tree while putting in text file. There are 3 ways in which a tree can be traveresed.

Then , input will be : 1 2 4 5 3 7 6 in preorder.
Clearly, root will be : 1 its left child as 2 , now taking 2 as center, 4 and 5 come under it, when subtree centered at 2 is completed, go to 4 etc....

Aplly the principal: CLR.
Remember, a unique tree is constructed from Pre-order and post -order.