nil
.
new
.
program bintree; type binTree = ^binTreeElem; binTreeElem = record val : integer; left : binTree; right : binTree; end; var theTree, node : binTree; begin new(node); node^.val := 5; node^.left := nil; node^.right := nil; theTree := node; new(node); node^.val := 12; node^.left := nil; node^.right := nil; theTree^.right = node; end.