各位大仙帮忙看看这个程序是哪儿出错啦。。。。。。。。谢谢

#include <iostream>
using namespace std;

#define OK 1
#define ERROR 0
#define NULL 0

typedef int elemtype;

typedef struct  l_node
{
    elemtype data;
    struct  l_node *next;
}l_node, *link_list;

//
elemtype create_list(link_list  &_list_head)
{
    _list_head = new l_node;
    _list_head->data = 0;//当前表长
    if( _list_head==NULL )
        return ERROR;
    else
        return OK;
}//

//尾插法
elemtype list_insert(link_list & _list_head, elemtype &elem)
{
    link_list q = new l_node;
    q->data = elem;
    q->next = NULL;
    if(_list_head->next == NULL)
    {
        _list_head->next = q;
        ++(_list_head->data);
        return OK;
    }
    else
    {
        link_list p = NULL;
        p = _list_head->next;
        while(p->next != NULL)
        {
             p = p->next;
        }
        p->next = q;
        ++(_list_head->data);
        return OK;
    }

}//

//
void print_list(link_list &_list_head)
{
    link_list p=NULL;
    p = _list_head;
    while(p->next != NULL)
    {
        cout<<"当前表长:"<<_list_head->data<<endl;
        cout<<"当前表元素:";
        cout<<p->data<<ends<<ends;
        p = p->next;
    }
}//

int main(int argc, char *argv[])
{
    link_list head = NULL;
    create_list(head);
    while(true)
    {
        elemtype e;
        cout<<"输入插入元素:";
        cin>>e;
        list_insert(head, e);
        print_list(head);
    }
    return 0;
}