请问下面的程序　是否有错，我用VC6.0运行不了
#include<iostream.h>

void CreateBTree(int *b_tree,int *nodelist,int len)
{
int i;
int level;

b_tree[1]=nodelist[1];
for(i=2;i<=len;i++)
{
level=1;
while(b_tree[level]!=0)
{
if(nodelist[i]<b_tree[level]) level=level*2;
else level=level*2+1;
}
b_tree[level]=nodelist[i];
}
}

void main()
{
int i,index;
int data;

int b_tree[16];
int nodelist[16];

cout<<"请输入树的结点元素的值：　";
cin>>data;
while(data!=0)//应该在这里出错
{
nodelist[index]=data;
index=index+1;
cin>>data;
}
for(i=1;i<16;i++)
cout<<nodelist[i];

CreateBTree(b_tree,nodelist,index);

cout<<"二叉树为：　";
for(i=1;i<16;i++)
cout<<i<<": "<<b_tree[i];
}