采用VC编程的词法分析器，代码可以直接运行，思路清晰易懂，可用作演示，也可帮助理解编译原理的词法分析过程-Programming using VC lexical analyzer, code can be directly run clear and understandable, can be used as a demo, but also can help the compiler to understand the principle of the process of lexical analysis