数据结构问题求NULL指针问题

Question

void DeleteList(CircleList L, int i)// 删除表中第i个元素
{
    CircleList head = (CircleList*)malloc(sizeof(CircleList));
    CircleList r = (CircleList*)malloc(sizeof(CircleList));
    head = L;
    r = head;
    int j = 0;

    while (r && (i - 1) > j)
    {
        r = r->next;
        j++;
    }
    CircleList m = (CircleList*)malloc(sizeof(CircleList));
        m= r->next;
        assert(m);
        r->next = m->next;
        free(m);
    L = head;
    printf("del ok\n");
}

这个函数总是运行不出来为什么呢？

Answer 1

CircleList m = (CircleList*)malloc(sizeof(CircleList));
m= r->next;
这里m分配了个寂寞，写反了吧
应该是 r->next = m;