在给定的文件中查询单词
word = [a_zA_z]
Term = word | "(" Expr ")"
Factor1 = Term | ~Term
Factor2 = Factor1 | Factor1 "&" Factor2 = Factor1 (ws "&" ws Factor2)*
Factor2 = Factor1 | Factor2 & Factor1 = Factor1 (ws "&" ws Factor1)*
Expr = Factor2 (ws "|" ws Expr)*
Expr = Factor2 | Expr "|" Factor2 = Factor2 (ws "|" ws Factor2)*
将所有源文件包含在一个文件夹中，然后#include "Expression.h"，即可使用程序相应的数据结构与接口。
以上传的Main.cpp，在Visual Studio Community演示效果：
