关于FlexTree的一些简单应用，对于初学Flex又用到Tree控件的有帮助-With regard to FlexTree some simple applications, for beginners to use Tree controls Flex also help

使用C语言写的语法分析小程序，要借助flex和bison工具，输入符合LCC语言语法的程序段，程序会输出语法树。-Using C language to write the syntax analysis of small programs, with the aid of bison and flex tools, input in accordance with the LCC syntax of the program segment, the program will output th