Re: binary tree and files

[tmoran@acm.org]

>what is a set of nested tuples??
Your tree diagram can be written as
father(null, child1(child2(null,little child1(little child2(null,null), null)))
where a "(" means "has the children:" and a ")" means "end of this set of
siblings"
You can read that back in and re-create the tree structure.

BTW, your textual description seems to me to indicate
father(child1,child2(little child1, little child2))
which is different than the diagram.

>there is no cycle i think in my program
  You can see that the nested list form could not handle cycles since
at some point a child would have to include one of his ancestors, who
occur to his left, as one of his descendants, who occur to his right.
Absent time travel, this cannot happen in a father, child genealogical tree.
As Oedipus demonstrated, it could happen if you included marriages.