显示未初始head内存

Question

//创建一个单链表
struct Node {
    int data;//4
    struct Node* next;//4
};

struct Node* create_link(struct Node* head)
{
    head = (struct Node *)malloc(sizeof(struct Node));//8
    head->next = NULL;

    struct Node* tail = head;

    for (int i = 1; i <= 10; i++)
    {
        struct Node* temp = head = (struct Node*)malloc(sizeof(struct Node));//分配一块内存空间
        temp->data = i;
        temp->next = NULL;
        tail->next = temp;
        tail = temp;
    }

    return head;
}

void print_link(struct Node* head)
{
    //不带头节点
    head = head->next;
    while (head != NULL) {
        printf("%d\n", head->data);
        head = head->next;
    }
}

int main() {
    struct Node *head;
    head = create_link(head);
    print_link(head);
    return 0;
}

```结果显示没初始化head内存

严重性    代码    说明    项目    文件    行    禁止显示状态
错误    C4700    使用了未初始化的局部变量“head”

Answer 1

```c
#include<stdio.h>
#include<stdlib.h>
//创建一个单链表
struct Node {
    int data;//4
    struct Node* next;//4
};
struct Node* create_link(struct Node* head)
{
    head = (struct Node *)malloc(sizeof(struct Node));//8
    head->next = NULL;
    struct Node* tail = head;
    for (int i = 1; i <= 10; i++)
    {
        struct Node* temp = (struct Node*)malloc(sizeof(struct Node));//分配一块内存空间
        temp->data = i;
        temp->next = NULL;
        tail->next = temp;
        tail = temp;
    }
    return head;
}
void print_link(struct Node* head)
{
    //不带头节点
    head = head->next;
    while (head != NULL) {
        printf("%d\n", head->data);
        head = head->next;
    }
}
int main() {
    struct Node *head;
    head = create_link(head);
    print_link(head);
    return 0;
}

```