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<b>Data Structures and Algorithms
with Object-Oriented Design Patterns in C++</b><br>
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<H3><A NAME="SECTION0010651000000000000000">Member Variables</A></H3>
<P>
The <tt>BinaryTree</tt> class has three member variables--<tt>key</tt>, <tt>left</tt>, and <tt>right</tt>.
All three of them are pointers.
The first is a pointer to an <tt>Object</tt> instance,
and the latter two are pointers to <tt>BinaryTree</tt> instances.
All three pointers are zero if the node represents the empty tree.
Otherwise, the tree must have a root and two subtrees.
Consequently, all three pointers are non-zero in a non-empty node.
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