通过设计、编制、调试一个DO-WHILE循环语句的语法及语义分析程序，加深对语法及语义分析原理的理解，并实现词法分析程序对单词序列的词法检查和分析。-through design, develop and debug a DO-WHILE cycle statement syntax and semantic analysis procedures, deepen the syntax and semantic analysis of the understanding of the principles and procedures to achieve lexical analysis of the sequence of lexical word inspection and analysis.