此程序共有两个类，Lexical进行词法分析，Syntax进行语法分析.对于语法分析，采用LR(1)分析法，判断程序是否满足规定的结构-this procedure there are two categories, Lexical for lexical analysis, Syntax syntax analysis. for the syntax analysis, LR (1) analysis, judge whether the procedures meet the require