c语言写双向链表头部插入的代码

以下是C语言写双向链表头部插入的代码：

#include <stdio.h>
#include <stdlib.h>

struct Node {
    int data;
    struct Node* next;
    struct Node* prev;
};

struct Node* head = NULL;

void insertAtHead(int value) {
    //创建一个新结点
    struct Node* newNode = (struct Node*)malloc(sizeof(struct Node));
    
    //设置结点的值
    newNode->data = value;
    newNode->prev = NULL;
    
    //头结点为空时，将新结点设为头结点
    if (head == NULL) {
        newNode->next = NULL;
        head = newNode;
        return;
    }
    
    //将新结点插入链表头部
    head->prev = newNode;
    newNode->next = head;
    head = newNode;
}

void printList() {
    struct Node* temp = head;
    while (temp != NULL) {
        printf("%d ", temp->data);
        temp = temp->next;
    }
    printf("\n");
}

int main() {
    insertAtHead(1);
    insertAtHead(2);
    insertAtHead(3);
    insertAtHead(4);
    printList();
    return 0;
}

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