程序代码：

#include<iostream>
using namespace std;
#define Maxlen 100
typedef char Elemtype;
typedef struct{
    Elemtype data[Maxlen];
    int length;
}Tree;
//链式定义
typedef struct node
{
    Elemtype data;
    struct node *lchild;
    struct node *rchild;
}Btree;
void InitTree(Tree *t,int m)
{
    t->length=m;
    for(int i=0;i<t->length;i++)
        t->data[i]='#';
    cout<<"二叉树初始化成功!\n";
}
void add(Tree *t,Elemtype a,int i)
{
    t->data[i]=a;
}
void display(Tree *t)
{
   cout<<"二叉树中的元素为:";
   for(int j=0;j<t->length;j++)
      cout<<t->data[j]<<' ';
   cout<<endl;
}
//转化函数
void change(Tree *t)
{
    Btree *stack[Maxlen];
    int top=0,to=1;
    stack[top]=(Btree*)malloc(sizeof(Btree));
    stack[top]->data=t->data[to-1];
    top++;
    while(top>0)
    {
       top--;
       if((t->data[2*to-1]!='#') && (t->data[2*to]!='#'))
       {
         stack[top]->lchild=(Btree*)malloc(sizeof(Btree));
         stack[top]->lchild->data=t->data[2*to-1];
         stack[top]->rchild=(Btree*)malloc(sizeof(Btree));
         stack[top]->rchild->data=t->data[2*to];
         top++;
         to++;
       }
     
    }
    cout<<"转化成功!\n";

}
void main()
{
    int n;
    Elemtype a;
    Tree tr;
    char b;
    cout<<"请输入需要输入的树的结点的个数:";
    cin>>n;
    InitTree(&tr,n);
    display(&tr);
    for(int i=0;i<n;i++)
    {
      cout<<"请输入二叉树的第"<<i+1<<"个结点,若为空结点,请输入#:";
      cin>>a;
      add(&tr,a,i);
    }
    cout<<"是否需要显示二叉树的元素y/n:";
    cin>>b;
    if (b=='y'|| b=='Y')
        display(&tr);
    change(&tr);
}