编译器的前期工作，词法分析、语法分析以及语义分析，本程序就是完成这样的功能，已经具有编译器的基本报错以及语义分析功能，供大家参考-The preparatory work of the compiler, lexical analysis, parsing and semantic analysis, this procedure is to accomplish this function, has a compiler error, and semantic analysis capabil