A method “tighten()” Program plan: Define the method “tighten()”, Assign the value returned from the parameterized method “tighten()”. Define the parameterized method “tighten()” with the return type of “IntTreeNode”, Check whether the root of the tree is not null, If it is true, assign the value returned from the method “tighten()” to the left child of the root. Assign the value returned from the method “tighten()” to the right child of the root. Check whether the left child of the root is not null and right child contains a null value, If it is true, set the left child of the root to the root of the tree. Otherwise, check whether the left child of the root is null and right child of the root is not null value. If it is true, set the right child of the root to the root of the tree. Return the root of the tree.

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Chapter 17, Problem 16E

Program Plan Intro

A method “tighten()”

Program plan:

Define the method “tighten()”,

Assign the value returned from the parameterized method “tighten()”.

Define the parameterized method “tighten()” with the return type of “IntTreeNode”,

Check whether the root of the tree is not null,

If it is true, assign the value returned from the method “tighten()” to the left child of the root.

Assign the value returned from the method “tighten()” to the right child of the root.

Check whether the left child of the root is not null and right child contains a null value,

If it is true, set the left child of the root to the root of the tree.

Otherwise, check whether the left child of the root is null and right child of the root is not null value.

If it is true, set the right child of the root to the root of the tree.

Return the root of the tree.

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