编译原理实验源代码 符号表的设计和实现（实验1）-Compile the source code principle experiment design and implementation of the symbol table (Experiment 1)

针对四则运算，写出字符集∑、相应的词法单元集合、词法单元对应的正则表达式集合 合理有效地设计符号表可存储四则运算中的各种词法单元及其属性等信息 列出关键算法的具体实现的思路-For four operations, write the character set Σ, the corresponding set of lexical units, lexical unit corresponds to a collection

实现了符号表的功能-Realize the function of the symbol table. . . . . . . . . . . . . . . . . . . . . .