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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="SECTION0011711000000000000000">Member Variables</A></H3>
<P>
To simplify the implementation of the algorithms,
the member variable <tt>parent</tt> has been added.
The <tt>parent</tt> member variable is a pointer to the <tt>BTree</tt> node
which is the parent of the given node.
Whereas the array of pointers to the children of a node,
i.e., the <tt>subtree</tt> member variable of the <tt>MWayTree</tt> class,
allows an algorithm to move down the tree;
the <tt>parent</tt> member variable admits movement up the tree.
Since the root of a tree has no parent,
the <tt>parent</tt> member variable of the root node contains the null pointer.
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