struct Node * inter_link(struct Node * chain1, int a, struct Node * chain2, int b) {
    int temp;
    struct Node *head, *p1, *p2, *pos;
   
    if (a >= b) {
        head = p1 = chain1;
        p2 = chain2;
    } else {
        head = p1 = chain2;
        p2 = chain1;
        temp = a, a = b, b = temp;
    }
   
    pos = head;
    while (p2 != NULL) {
        p1 = p1->next;
        pos->next = p2;
        pos = p2;
        p2 = p2->next;
        pos->next = p1;
        pos = p1;
    }
    return head;
}
我就是想不明白这函数是怎么个运行过程，求解释，能附图最好了

程序的实现过程我还是不懂呢。。这个链表的地址指针我总想不明白，还有就是链表里的“=”号和“->”啥区别，都是指向的意思么