Extend the expression evaluator in Section 13.5 so that it can handle the % operator as well
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Extend the expression evaluator in Section 13.5 so that it can handle the % operator as well as a “raise to a power” operator ^. For example, 2 ^ 3 should evaluate to 8. As in mathematics, raising to a power should bind more strongly than multiplication: 5 * 2 ^ 3 is 40.
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