typedef struct SNAKE //蛇身的一个节点
{
    int x;
    int y;
    struct SNAKE *next;
}snake;


snake *head, *food;//蛇头指针，食物指针
snake *q;//遍历蛇的时候用到的指针


void Pos(int x,int y)//设置光标位置
{
    COORD pos;
    HANDLE hOutput;
    pos.X=x;
    pos.Y=y;
    hOutput=GetStdHandle(STD_OUTPUT_HANDLE);
    SetConsoleCursorPosition(hOutput,pos);
}

void initsnake()//初始化蛇身
{
    snake *tail;
    int i;
    tail=(snake*)malloc(sizeof(snake));//从蛇尾开始，头插法，以x,y设定开始的位置//
    tail->x=24;
    tail->y=5;
    tail->next=NULL;
    for(i=1;i<=4;i++)
    {
        head=(snake*)malloc(sizeof(snake));
        head->next=tail;
        head->x=24+2*i;
        head->y=5;
        tail=head;
    }
    while(tail!=NULL)//从头到为，输出蛇身
    {
        Pos(tail->x,tail->y);
        printf("■");
        tail=tail->next;
    }
}
void createfood()//随机出现食物
{
    snake *food_1;
    srand((unsigned)time(NULL));
    food_1=(snake*)malloc(sizeof(snake));
    while((food_1->x%2)!=0)    //保证其为偶数，使得食物能与蛇头对其
    {
        food_1->x=rand()%52+2;
    }
    food_1->y=rand()%24+1;
    q=head;
    while(q->next==NULL)
    {
        if(q->x==food_1->x && q->y==food_1->y) //判断蛇身是否与食物重合
        {
            free(food_1);
            createfood();
        }
        q=q->next;
    }
    Pos(food_1->x,food_1->y);
    food=food_1;
    printf("■");
}