新手写链表，错误已找出，求解决

Question

 #include<iostream>
using namespace std;

struct linklist
{
    linklist* next;
    int data;
};

linklist* initll()
{
    linklist* temp = new linklist;
    temp->next = NULL;
    temp->data = 0;
    return temp;
}

void output(linklist* head)
{
    cout << "该链表的长度为：" << head->data << endl;
    if (head->data != 0)
    {
        cout << "该链表的内容为：";
        linklist* temp = head->next;
        for (int i = 0; i < head->data; i++)
        {
            cout << temp->data << ",";
        }
        cout << endl;
    }
}

void insert(linklist* head, int pos, int value)
{
    linklist* a = new linklist;
    a->data = value;
    linklist* p = head;
    for (int i = 1; i < pos; i++)//查找位置
    {
        p = p->next;
    }
    a->next = p->next;
    p = a->next;
    head->data++;
}

int main()
{
    linklist* head;
    head = initll();
    output(head);
    for (int i = 0; i < 10; i++)
    {
        insert(head, 1, i);
    }
    output(head);
    cout << endl;
}

错误在主函数中最后一个输出函数，在输出内容的时候出错？为什么呢？

Answer 1

insert操作有问题，
a->next = p->next;

p->next = a;