用C++编写的语义分析程序，基于LR文法，能实现词法分析，语法分析，返回相应结果，并返回归约过程和四元式。并附有实验报告和源工程。-Written in C++ semantic analysis program, based on the LR grammar, to achieve lexical analysis, parsing, returns the appropriate result, and return to the process of reduction and quat