C语言结构体怎么生成一个双链表

生成一个双链表需要定义一个结构体来表示链表中的每个节点，该结构体应该包含指向前一个节点和后一个节点的指针。下面是一个示例代码：

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

struct Node {
    char name[20];
    int age;
    char gender;
    struct Node *prev;
    struct Node *next;
};

struct Node *head = NULL;
struct Node *tail = NULL;

void addNode(char *name, int age, char gender) {
    struct Node *newNode = (struct Node*) malloc(sizeof(struct Node));
    strcpy(newNode->name, name);
    newNode->age = age;
    newNode->gender = gender;
    newNode->prev = NULL;
    newNode->next = NULL;

    if (head == NULL) {
        head = newNode;
        tail = newNode;
    } else {
        tail->next = newNode;
        newNode->prev = tail;
        tail = newNode;
    }
}

void printList() {
    struct Node *current = head;
    while (current != NULL) {
        printf("Name: %s, Age: %d, Gender: %c\n", current->name, current->age, current->gender);
        current = current->next;
    }
}

int main() {
    addNode("Alice", 25, 'F');
    addNode("Bob", 30, 'M');
    addNode("Charlie", 35, 'M');
    addNode("David", 40, 'M');

    printf("Forward:\n");
    printList();

    printf("\nBackward:\n");
    struct Node *current = tail;
    while (current != NULL) {
        printf("Name: %s, Age: %d, Gender: %c\n", current->name, current->age, current->gender);
        current = current->prev;
    }

    return 0;
}

该代码定义了一个名为Node的结构体，其中包含了指向前一个节点和后一个节点的指针。addNode函数用于向链表中添加新节点，printList函数用于打印链表中的所有节点。在main函数中，我们向链表中添加了四个节点，并分别打印了正向和反向的链表。