表达式求值的经典算法。

Classic algorithms for expression evaluation.

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编写代码对算术表达式求值的经典方法由Donald Knuth描述于1962年(请参阅参考资料)。

The classic approach to writing code to evaluate arithmetic expressions was described by Donald Knuth in 1962 (see Resources). Knuth Outlines three steps.

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不过，我们还是先看看表达式求值的经典算法，这样您就会明白W 3eval方法的差异究竟有多少。

First, however, we'll look at the classical algorithms for evaluating expressions, so you can see how W3Eval's approach differs.

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