如果逻辑上不要求运算符过程调用自身，请移除任何递归调用，或将其替换为不调用自身过程的语句。

If your logic does not require the operator procedure to call itself, then remove any recursive calls or replace them with statements that do not call their own procedure.

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每个运算符都表示转换过程的一个步骤。

Each operator represents a step in the transformation process.

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使用目前常用的算符优先法，对通用表达式计算过程进行了介绍，并对其中的关键问题——运算符优先矩阵的设计和实现进行了研究。

Using the current commonly used operator priority method, introduces a common expression of the calculation process, and one of the key issues, operator precedence matrix design and implementation.

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