// Insert a new node in the binary search tree.
// If the root node is null, create the root node here.
// Otherwise, call the insert method of class TreeNode.
public void InsertNode( IComparable insertValue )
{
if ( root == null )
root = new TreeNode( insertValue );
else
root.Insert( insertValue );
}
// recursive method to perform inorder traversal
private void InorderHelper( TreeNode node )
{
if ( node != null )
{
// traverse left subtree
InorderHelper( node.LeftNode );
// output node data
Console.Write( node.Data + " " );
// traverse right subtree
InorderHelper( node.RightNode );
} // end if
}
// construct an empty Tree of IComparable
public Tree()
{
root = null;
}
// insert TreeNode into Tree that contains nodes;
// ignore duplicate values
public void Insert( IComparable insertValue )
{
if ( insertValue.CompareTo(Data) < 0 ) // insert in left subtree
{
// insert new TreeNode
if ( LeftNode == null )
LeftNode = new TreeNode( insertValue );
else // continue traversing left subtree
LeftNode.Insert( insertValue );
} // end if
else if ( insertValue.CompareTo( Data ) > 0 ) // insert in right
{
// insert new TreeNode
if ( RightNode == null )
RightNode = new TreeNode( insertValue );
else // continue traversing right subtree
RightNode.Insert( insertValue );
} // end else if
}
