可以打开任意位置和名称的原文件进行词法分析，可以进行非法字符和数字后边跟字母的错误判断，如果没有错误则提示“词法分析正确完成！”，并且可以选择输出token.txt（token文件） string.txt（符号表） number.txt（常数表）三个文件-Can turn any location and name of the original document lexical analysis can be carried out illegal characters and figures behind the letters with the wrong judge, if no error was prompted　completion of lexical analysis is correct! , And can choose the output token.txt (token file) string.txt (symbol table) number.txt (Constant Table) three documents