用简单优先法设计并编写一个WHILE循环语句的语法及语义分析程序并输出用四元式表示的中间代码，同时实现词法分析程序对单词序列的词法检查和分析。-simple priority Design and prepare a WHILE loop is the syntax and semantic analysis procedures used and output 4 yuan, said the middle-code, while achieving lexical analysis procedure right word accidence sequence of inspection and analysis.