一. 实验目的： 设计、编写和调试一个具体的词法分析程序，加深对词法分析理论和自动词法分析工具的理解、实践和掌握。 二. 实验要求： ① 学习和理解正则表达式理论,写出C—语言的记号的完整的正则表达式;(适当使用正则定义) ② 学习和理解有限机理论,根据前面的正则表达式,用基于经验的方法画出C—语言的记的DFA图; ③ 用基于DFA图的算法编写C—语言的词法分析程序; ④ 学习词法分析程序的自动生成工具,使用LEX工具实现C—语言的词法分析程序.
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