设计、编制并调试一个词法分析程序。 算法的基本任务是从字符串表示的源程序中识别出具有独立意义的单词符号，其基本思想是根据扫描到的单词符号的第一个字符种类，拼出相应的单词符号，如果扫描到的单词符号是关键字，则到关键字种别码表中查出相应的种别码，并将其种别码和单词符号本身存入二元组-Design, preparation and commissioning of a lexical analyzer. Basic task of the algorithm is to identify th

AutoCAD s Symbol Tables. We will create a new layer create a Block Definition and explore how to use an Iterator to step through the entities contained in the Model Space block table record. In this section of the tutorial you will be introduced to t