数据结构经典实例，建立二叉排序树。从键盘上输 入一串正整数， 最后输入－1作为输入结束的标志。如输入的序列为：2，5，7，23，48，96，……，-1。请以这些正整数的值作为二叉排序树中的结点的数据场之值，建立一棵二叉排序树。-Classic examples of data structures, to establish binary sort tree. Keyboard input from a string of positive integers, the last input-1 as the input end of the sign. If the input sequence: 2,5,7,23,48,96, ... ...,-1. Please these are integer values as binary sort tree nodes of the value data field, the establishment of a binary sort tree.