编译原理课程作业，词法分析器。简单的对于一段C程序进行词法分析-Compiler theory course work, lexical analyzer

用C语言编写的编译原理词法分析器，可读取文件，功能非常强大(The Compiling Principle lexical analyzer, written in C language, can read the file, and the function is very powerful.)