struct tree{
    int left;
    int data;
    int right;
};

typedef  struct tree treenode;
treenode b_tree[15];

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

    b_tree[0].data = nodelist[0];
    for (i = 1; i < len; i++){
        b_tree[i].data = nodelist[i];

自顶

半拉可及的代码

struct tree{
    int left;
    int data;
    int right;
};

typedef  struct tree treenode;
treenode b_tree[15];

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

    b_tree[0].data = nodelist[0];                         //这里出现
    for (i = 1; i < len; i++){
        b_tree[i].data = nodelist[i];                    //这里出现

？？？

函数里的参数类型错了。
void create_btree(int *b_tree, int *nodelist, int len)改为void create_btree(treenode *b_tree, int *nodelist, int len)

哎 还真是