一个小程序，用c++语言实现简单的一遍编译器，完成中缀表达式与后缀表达式之间的转换。-a small program, c simple language what the compiler, completed sergeant with the suffix expression between the expression change.

实现以扩充C0文法为源文法，四元式为中间代码，x86汇编代码为目标代码的编译器。-C0 to achieve to expand as the source grammar grammar, style for the intermediate quaternary code, x86 assembly code for the object code of the compiler.