codegen.py编译算式并在pyc文件下生成bycode。pyc可以直接在终端运行，输入算式得到结果。-A compiler for equation.

一个用antlr写的简单四则运算的编译器，eclipse中可以运行，编译原理-With antlr write a simple arithmetic compiler, eclipse can run, compiler theory

这个C程序用来实现计算器功能。程序主要用编译原理进行处理编写。-This C program used to implement the calculator function. The main principles of the program are processed by the compiler to write.