用C语言写一个双向链表实现头插法

可以的，以下是用 C 语言实现双向链表的头插法代码：

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

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

Node* createNode(int data) {
Node* newNode = (Node*)malloc(sizeof(Node));
newNode->data = data;
newNode->prev = NULL;
newNode->next = NULL;
return newNode;
}

void insertAtHead(Node** head, int data) {
Node* newNode = createNode(data);
if (*head == NULL) {
*head = newNode;
return;
}
(*head)->prev = newNode;
newNode->next = *head;
*head = newNode;
}

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

int main() {
Node* head = NULL;
insertAtHead(&head, 1);
insertAtHead(&head, 2);
insertAtHead(&head, 3);
insertAtHead(&head, 4);
printList(head);
return ;
}