补齐以下代码#include <stdio.h> #include <stdlib.h> struct node { int data; struct node *next; }; void sort(struct node *head); //采用选择排序法思想，对结点数据进行交换处理 void destroy(struct node* head); struct node* creatlink(); void traverse(struct node* head); int m

代码中缺少函数 `main`，需要补充。

以下是完整代码：

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

struct node {
    int data;
    struct node *next;
};

void sort(struct node *head);
void destroy(struct node* head);
struct node* creatlink();
void traverse(struct node* head);

int main() {
    struct node *head = creatlink(); // 创建带头结点的链表
    sort(head); // 对链表进行排序
    traverse(head); // 遍历链表
    destroy(head); // 销毁链表
    return 0;
}

struct node *creatlink() {
    struct node *head = (struct node*)malloc(sizeof(struct node)); // 创建头结点
    struct node *p = head;
    int num;
    printf("请输入数据（输入0结束）：\n");
    scanf("%d", &num);
    while (num) {
        struct node *newnode = (struct node*)malloc(sizeof(struct node));
        newnode->data = num;
        newnode->next = NULL;
        p->next = newnode;
        p = p->next;
        scanf("%d", &num);
    }
    return head;
}

void sort(struct node *head) {
    struct node *p = head->next;
    while (p != NULL) {
        struct node *q = p->next;
        while (q != NULL) {
            if (p->data > q->data) {
                int temp = p->data;
                p->data = q->data;
                q->data = temp;
            }
            q = q->next;
        }
        p = p->next;
    }
}

void traverse(struct node *head) {
    struct node *p = head->next;
    printf("排序后的链表数据为：\n");
    while (p != NULL) {
        printf("%d ", p->data);
        p = p->next;
    }
    printf("\n");
}

void destroy(struct node *head) {
    struct node *p = head;
    while (p != NULL) {
        struct node *q = p->next;
        free(p);
        p = q;
    }
}