bison和Lex写的计算器，在cmd定位到文件夹，执行ini.bat和lexyacc.bat，并且用vc连接可以生成一个具有符号表的计算器。-bison and Lex written calculators, navigate to the folder in cmd, implementation ini.bat and lexyacc.bat, and used vc connection can generate a symbol table with the calculator.