说明：  词法分析器。 要求：1.读出所给文件的所有词 2.将所有词输出写入一个txt文档中。 3.每个词用特殊符号‘^’隔开 源程序为自己所编译的cpp文件，即“text2.cpp”,Compile——〉Build——〉BuildExiecute，将结果写入另一个文件“after_execute.txt”中。
(lexical analyzer. Requirements : 1. Read out documents to all the words of two. Output of all words into a txt documents. 3. Each word with a special symbol '^' separate source for the translation of their documents cpp, "text2.cpp" Compile-- "Build--" BuildExiecute. The results will be included in another document "after_execute.txt".)