这是一个c++环境下的模拟文件系统的部分源代码，支持词法分析，其中用到头文件#Include \"lex.h\"-c This is a simulated environment of the file system source code, support for lexical analysis, which uses the first document # Include "lex.h"

借助Lex 和Yacc 进行词法语法分析，初学者可以参考参考-With Lex and Yacc parsing lexical, beginners can refer to reference