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.
语法分析采用自底向上分析方法，根据语言语法分析标记序列，构建程序的语法树。
Adopting bottom-up parsing algorithms, the parse analyse the sequence of tokens and form the syntax tree of EP program.
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