来源：PTA 6-8求二叉树高度
题目：

#include <stdio.h>
#include <stdlib.h>

typedef char ElementType;
typedef struct TNode *Position;
typedef Position BinTree;
struct TNode{
ElementType Data;
BinTree Left;
BinTree Right;
};

BinTree CreatBinTree(); /* 实现细节忽略 */
int GetHeight( BinTree BT );

int main()
{
BinTree BT = CreatBinTree();
printf("%d\n", GetHeight(BT));
return 0;
}

收获：当作预习二叉树的练习题