main.c

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

typedef struct student{
    int id;
    int score;
    struct student *next;
    struct student *on;
} LinkList;
LinkList *link_list_creat(int n){
    LinkList *head, *node, *end,*head_temp;//定义头节点，普通节点，尾部节点；
    head = (LinkList*)malloc(sizeof(LinkList));//分配地址
    end = (LinkList*)malloc(sizeof(LinkList));
    head_temp=head;

    head->score=0;
    head->id=0;
    head->on=end;

    end->score=n+1;
    end->id=n+1;
    end->next=head;

    for(int i = 1; i < n+1; i++) {
        node = (LinkList*)malloc(sizeof(LinkList));
        node->id=i;
        node->score = 0;
        node->on=head_temp;
        head_temp->next = node;
        head_temp = node;
    }

    head_temp->next = end;
    end->on=head_temp;
    return head;
}

void link_list_change(LinkList *list,int id,int score) {//n为第n个节点
    LinkList *t = list;
    while(t->next!=NULL && t->id!=id) {
        t=t->next;
    }
    t->score=score;
}


int main(void) {
    LinkList *n=link_list_creat(3);

    link_list_change(n,1,1);
    link_list_change(n,2,2);
    link_list_change(n,3,3);

    // while (n->next != NULL) {
    //     printf("id:[%d] \t score[%d]\n",n->id,n->score);
    //     n = n->next;
    //     _sleep(1000);
    // }

    while (n->on != NULL) {
        printf("id:[%d] \t score[%d]\n",n->id,n->score);
        n = n->on;
        _sleep(1000);
    }
}