#include<stdlib.h>
#include<iostream.h>
#include<malloc.h>
#include<string.h>
#include<stdio.h>
enum Status {OVERFLOW,OK};
typedef   int TElemType ;
typedef struct BiTNode{
    TElemType data;
    struct BiTNode *lchild,*rchild;
}BiTNode,*BiTree;
Status  CreateBiTree_PreOrder(BiTree&T)

{
      char ch;
     cin>>ch;
     if(ch==' ')T=NULL;
     else{
            if(!(T=(BiTNode*)malloc(sizeof(BiTNode))))
            exit(OVERFLOW);
            T->data=ch;
            CreateBiTree_PreOrder(T->lchild);
            CreateBiTree_PreOrder(T->rchild);
    }

    return OK;
}

void main()
{   
    
    Status CreateBiTree_PreOrder(BiTree&T);
}