Question: We use postfix notation in the example in this chapter because it eliminates the need to parse an infix expression by precedence rules and parentheses.

We use postfix notation in the example in this chapter because it eliminates the need to parse an infix expression by precedence rules and parentheses. Some infix expressions do not need parentheses to modify precedence. Implement a method for the ExpressionTree class that will determine whether an integer expression would require parentheses if it were written in infix notation.

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