Creating complex expressions such as the one in the preceding example requires a thorough understanding of the rules of operator precedence.

创建前面示例中这样的复杂表达式要求彻底理解运算符优先级的规则。

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This type of expression uses one pair of parentheses for each operator. Theparentheses dictate the order of operations; there is no ambiguity. There isalso no need to remember any precedence rules.

有一种书写表达式的方法叫做“完全括号”，这种表达式把每一个操作符都加了括号，表达完全精确，也不必记忆优先级规则。

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