自创的算法，输入表达式，建立二叉树的程序，然后输出前缀中缀后缀表示法，利用的对表达式的分割与递归实现输入，同时这也是一个完整的波兰式转换程序，相当稳健-own algorithm, the importation of expression, the establishment of the binary tree and then output the suffix prefix which is made up of the method, using the right expression Segmentation and recursive input, and this was also a Polish integrity of the conversion process, sound