该程序是在实验4程序基础上实现的一个手工编码实现的简单计算器，其词法分析器调用接口为lex()，语法分析器调用接口为SLR1(),语义动作调用接口为run()。-The program is based on the experimental procedure 4, a hand-coding a simple calculator, the lexical analyzer is called interface lex (), parser call interface for the S