词法分析

1、通过设计编制调试一个具体的词法分析程序，加深对词法分析原理的理解。并掌握在对程序设计语言源程序进行扫描过程中将其分解为各类单词的词法分析方法。

2、编制一个读单词过程，从输入的源程序中，识别出各个具有独立意义的单词，即基本关键字、标识符、常数、运算符、分隔符五大类。并依次输出各个单词的内部编码及单词符号自身值。（遇到错误时可显示“Error”，然后跳过错误部分继续显示）

有实验报告-Lexical Analysis 1, through the design of the preparation of debugging a specific lexical analysis process, deepen their understanding of the principle of lexical analysis. And mastery of programming language source code to scan the process of its decomposition for different types of word lexical analysis. 2, the preparation of a process of reading words from the input source program to identify each word has an independent significance, that is the basic keywords, identifiers, constants, operators, delimiters five categories. And followed by all the output of the internal code word and the word itself the value of symbols. (Encountered an error when the display