leetcode707指针赋值报错

Question

leetcode707 设计链表

几乎都是这个报错，看不懂什么意思
指针这样赋值有什么问题，求解答

typedef struct {
    int val;
    struct MyLinkedList* next;
}MyLinkedList;

MyLinkedList* myLinkedListCreate() {
    MyLinkedList* head = (MyLinkedList*)malloc(sizeof(MyLinkedList));
    if (head == NULL)
        exit(-1);
    head->next = NULL;
    return head;
}

int myLinkedListGet(MyLinkedList* obj, int index) {
    MyLinkedList* cur = obj->next;
    for (int i = 0; cur != NULL; i++)
    {
        if (i == index)
            return cur->val;
        else
            cur = cur->next;
    }

    return -1;
}

void myLinkedListAddAtHead(MyLinkedList* obj, int val) {
    MyLinkedList* shead = (MyLinkedList*)malloc(sizeof(MyLinkedList));
    if (!shead)
        exit(-1);
    shead->val = val;
    shead->next = obj->next;
    obj->next = shead;
}

void myLinkedListAddAtTail(MyLinkedList* obj, int val) {
    MyLinkedList* cur = obj;
    MyLinkedList* NewTail = (MyLinkedList*)malloc(sizeof(MyLinkedList));
    if (!NewTail || !cur)
        exit(-1);
    NewTail->val = val;
    NewTail->next = NULL;
    while (cur && cur->next) //
        cur = cur->next;
    cur->next = NewTail;
}

void myLinkedListAddAtIndex(MyLinkedList* obj, int index, int val) {
    if (index == 0)
    {
        myLinkedListAddAtHead(obj, val);
        return;
    }
    MyLinkedList* cur = obj->next;
    for (int i = 1; cur != NULL; i++)
    {
        if (index == i)
        {
            MyLinkedList* nNode = (MyLinkedList*)malloc(sizeof(MyLinkedList));
            if (nNode == NULL)
                eixt(-1);
            nNode->val = val;
            nNode->next = cur->next;
            cur->next = nNode;
            return;
        }
        else
            cur = cur->next;
    }
}

void myLinkedListDeleteAtIndex(MyLinkedList* obj, int index) {
    MyLinkedList* cur = obj;
    for (int i = 0; cur->next != NULL; i++)
    {
        if (index == i)
        {
            MyLinkedList* tmp = cur->next;
            if (!tmp)
            {
                tmp = NULL;
                free(tmp);
            }
            else
            {
                cur->next = tmp->next;
                free(tmp);
            }
            return;
        }
        else
            cur = cur->next;
    }
}  //

void myLinkedListFree(MyLinkedList* obj) {
    MyLinkedList* shead = (MyLinkedList*)malloc(sizeof(MyLinkedList));
    if (!shead)
        exit(-1);
    shead->next = obj;
    MyLinkedList* cur = shead;
    MyLinkedList* tmp;
    while ((tmp = cur->next))
    {
        cur->next = tmp->next;
        free(tmp);
    }
    free(shead);
    return;
}

Answer 1

结构体声明错了，要先有一个名字才能在结构体里面用自身的名字

typedef struct node {
    int val;
    struct node* next;
}MyLinkedList;