词法分析程序，keyword作为关键字token_pl作为存储分析结果的表，表里有种别码。先输入一句子，放在line的缓冲里，然后用getchar联词，只到去完为止，应用相关的状态转换分析，对输入的字符进行相关的分类及编码，然后输出相应的二元分析室便于进行下一步分析。-Lexical analysis, keyword keyword token_pl as the results of the analysis as a storage table, do not have a code table. Enter a sentence on the line in the buffer, and then in conjunction with the word getchar only last until the end, the application state transition-related analysis, the input characters in the classification and coding-related, and then the corresponding binary output analysis room analysis to facilitate the next step.