本代码为根据老师的课程设计要求做的小编译器的词法分析部分和语法分析部分，附件中有老师的要求文档，还有语法分析时使用到的分析表-This code is based on the teacher' s curriculum design requirements to do a small part of the compiler' s lexical analysis and syntax analysis section, in the annex to the request o