A method “evenLevels()” Program plan: Define the method “evenLevels()”, Assign the value returned from the parameterized method “evenLevels()”. Return the list. Define the parameterized method “evenLevels()”, Check whether the root of the binary tree is not null, If it is true, assign the value returned from the method “evenLevels()” to the left child of the node. Assign the value returned from the method “evenLevels()” to the right child of the node. Check whether the right and left child of the node is null and the remainder when dividing height of the tree by “2” is “1”, `If it is true, assign the node with null value. Return the node.

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Chapter 17, Problem 19E

Program Plan Intro

A method “evenLevels()”

Program plan:

Define the method “evenLevels()”,

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

Return the list.

Define the parameterized method “evenLevels()”,

Check whether the root of the binary tree is not null,

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

Assign the value returned from the method “evenLevels()” to the right child of the node.

Check whether the right and left child of the node is null and the remainder when dividing height of the tree by “2” is “1”,

`If it is true, assign the node with null value.

Return the node.

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