Ruby Quiz(James Edward Gray II氏が管理)の#148「Postfix to Infix」の一部の翻訳(意訳を含む)。
The big advantage of postfix expressions is that they are built with a stack in mind. This turns out to be a powerful way to do math both for computers and humans. HP makes some great RPN calculators that literally display a stack on the screen and give you the tools the manipulate it. To handle the expression:
2 3 +
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