LR分析法对表达式文法进行自底向上语法分析的算法 个个作业仅供参考，态度决定一切。-LR analysis of expression grammar for the bottom-up parsing algorithm everyone operations for reference purposes only, attitude is everything.

设计一个WHILE循环语句的词法﹑语法及语义分析程序，语法分析选择LR方法，采用用语法制导翻译输出中间代码四元式。-The design of a WHILE loop ﹑ the lexical grammar and semantic analysis procedures, choice of LR parsing method guided by syntax translation output intermediate code quaternion type.