通过设计、编制、调试一个递归下降语法分析程序，实现对词法分析程序所提供的单词序列进行语法检查和结构分析，掌握常用的语法分析方法。通过本实验，应达到以下目标：

1、掌握从源程序文件中读取有效字符的方法和产生源程序的内部表示文件的方法。

2、掌握词法分析的实现方法。

3、上机调试编出的词法分析程序。

-By designing, developing, debugging a recursive descent parser, lexical analysis procedure to achieve the word provided by sequence analysis and structure grammar checker, grammar master the analytical methods used. Through this experiment should be to achieve the following objectives: 1, master read from the source document effective methods and character of the internal source that generated documents. 2, grasp the realization of lexical analysis methods. 3, on the machine for a debugging process of lexical analysis.