语义分析

在实验二的基础上，对符合给定的文法的字符串（算术表达式），给出结果。

内容：在实验二的基础上，对符合给定的文法的字符串（算术表达式），给出结果。编程序实现并对程序进行测试。

-Semantic analysis on the basis of the second experiment, given the results in line with the string of a given grammar (arithmetic expression). : On the basis of the second experiment, in line with the string of a given grammar (arithmetic expression) gives the result. Programmed and procedures for testing.