Tree displaying


Displaying a binary tree.

Source: PROLOG programming for artificial intelligence, 3rd Edition, Harlow, 2001, ISBN 0-201-40375-7.


Program source code:


% Figure 9.17  Displaying a binary tree.
% show( Tree): display binary tree
show( Tree)  :-
  show2( Tree, 0).
% show2( Tree, Indent): display Tree indented by Indent
show2( nil, _).
show2( t( Left, X, Right), Indent)  :-
  Ind2 is Indent + 2,                 % Indentation of subtrees
  show2( Right, Ind2),                % Display right subtree
  tab( Indent), write( X), nl,        % Write root
  show2( Left, Ind2).                 % Display left subtree


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