C语言小项目：贪吃蛇

我的贪吃蛇实现的功能：
①通过吃食物来增加身体的长度
②可以手动增加蛇跑动的速度
③通过加速的次数也可以增加最终的分数
下面是我的代码实现：

#pragma once

#define BUNDER  "□"
#define FOOD  "○"
#define C 20
#define L 13
enum Dir
{
    up,
    left,
    down,
    right,
};
enum Stat
{
    ok,
    KillBySelf,
    KillByWall,
    Exit,
};
typedef struct Node  //每个点包含的东西
{
    int x;
    int y;
    struct Node* next;
}Node,*pNode;
typedef struct Snake   //该贪吃蛇必备的能力
{
    pNode pSnake;   //指向蛇的指针
    pNode pFood;    //蛇的食物的实现
    enum Dir dir;      //蛇的运动方向
    enum Stat stat;     //蛇的状态
    int sleeptime;
}Snake,*pSnake;

//进入游戏前的界面
void ShowWelcome();

//设置光标的位置
void SetPos(int x,int y);

//初始化游戏的地图
void CreateMap();

//初始化蛇的各种状态以及初始化蛇
void InitSnake(Snake* s);

//初始化蛇的食物
void InitFood(Snake* s); //比较麻烦，封装为函数

//让蛇动起来
void SnakeRun(Snake* s);

//让用户可以控制蛇的移动
void SnakeRun2(Snake* s);

//判断蛇有没有撞到自己
void KillSelf(Snake* s);

//判断蛇有没有撞到墙
void KillWall(Snake* s);

//游戏结束
void GameEnd(Snake* s);

//统计游戏的分数
int Grade(Snake* s);

#include<stdio.h>
#include<stdlib.h>
#include"snake.h"
#include<windows.h>
//设置光标
void SetPos(int x,int y)
{
    HANDLE handle = GetStdHandle(STD_OUTPUT_HANDLE);
    COORD pos;
    pos.X = x;
    pos.Y = y;
    SetConsoleCursorPosition(handle,pos);
}
//打印地图
void CreateMap()
{
    int i = 0;
    for(;i<=56;i=i+2)
    {
        SetPos(i,0);
        printf(BUNDER);
        SetPos(i,26);
        printf(BUNDER);
    }
    for(i=1;i<=25;i++)
    {
        SetPos(0,i);
        printf(BUNDER);
        SetPos(56,i);
        printf(BUNDER);
    }
}
//进游戏的界面
void ShowWelcome()
{
    SetPos(20,10);
    printf("欢迎来到贪吃蛇小游戏！\n");
    SetPos(30,13);
    printf("请使用↑ ↓ ← → 来控制蛇的移动方向.\n");
    system("pause");
    system("cls");
}

void InitSnake(Snake* s)
{
    int i = 0;
    Node* cur = NULL;
    Node* head = (Node*)malloc(sizeof(Node));
    head->x = C;
    head->y = L;
    head->next = NULL;
    for(i = 1;i <= 4;++i)
    {
        s->pSnake = (Node*)malloc(sizeof(Node));
        s->pSnake->next = head;
        s->pSnake ->x = C + 2*i;
        s->pSnake ->y = L;
        head = s->pSnake ;
    }
    //打印蛇
    while(head != NULL)
    {
        SetPos(head->x ,head->y );
        printf(FOOD);
        head = head->next ;
    }
    s->sleeptime = 1000;
    s->stat = ok;
    s->dir = right;
}
void InitFood(Snake* s) //比较难，封装为函数
{
    pNode pFood = NULL;
    pNode cur = NULL;
    pFood = (Node*)malloc(sizeof(Node));
again:
    cur = s->pSnake ;
    //判断蛇的食物的位置，要和边框对齐
    do{
        pFood->x = rand() % 53 + 2;
    }while(pFood->x  % 2 != 0);
    pFood->y = rand() % 25 + 1;
    while(cur != NULL)
    {
        if(cur->x == pFood->x && cur->y == pFood->y )
            goto again;
        cur = cur->next ;
    }
    s->pFood = pFood;
    SetPos(pFood->x ,pFood->y );
    printf(FOOD);
}
int NextIsFood(Snake* s)
{
    if(s->pSnake->x == s->pFood ->x  && s->pSnake->y == s->pFood ->y  )
    {       
        return 1;
    }
    return 0;
}
void Eat(Snake* s,pNode node)
{
    pNode cur = NULL;
    node->next = s->pSnake ;
    s->pSnake = node;
    cur = s->pSnake;
    while(cur != NULL)
    {
        SetPos(cur->x ,cur->y );
        printf(FOOD);
        cur = cur->next ;
    }
    //把食物吃了后要在创建一个食物
    InitFood(s);
}
void NextNoFood(Snake* s,pNode node)
{
    pNode cur = NULL;
    node->next = s->pSnake ;
    s->pSnake = node;
    cur = s->pSnake ;
    while(cur->next->next != NULL)
    {
        SetPos(cur->x ,cur->y );
        printf(FOOD);
        cur = cur->next ;
    }
    SetPos(cur->next ->x ,cur->next ->y );
    printf("  ");
    free(cur->next );
    cur->next = NULL;
}
void SnakeRun(Snake* s)
{
    pNode NextNode = (Node*)malloc(sizeof(Node));
    NextNode->x = s->pSnake ->x ;
    NextNode->y = s->pSnake ->y ;
    switch(s->dir )
    {
    case up:
        NextNode->y -= 1;
        break;
    case down:
        NextNode->y += 1;
        break;
    case left:
        NextNode->x -= 2;
        break;
    case right:
        NextNode->x += 2;
        break;
    default:
        break;
    }
    if(NextIsFood(s))
    {
        Eat(s,NextNode);
        Grade(s);
    }
    else
    {
        NextNoFood(s,NextNode);
    }
}
void SnakeRun2(Snake* s)
{
    do
    {
        if(GetAsyncKeyState(VK_UP) && s->dir != down )
        {
            s->dir = up;
        }
        else if(GetAsyncKeyState(VK_DOWN) && s->dir != up )
        {
            s->dir = down;
        }
        else if(GetAsyncKeyState(VK_LEFT) && s->dir != right )
        {
            s->dir = left;
        }
        else if(GetAsyncKeyState(VK_RIGHT) && s->dir != left )
        {
            s->dir = right;
        }
        else if(GetAsyncKeyState(VK_ESCAPE))
        {
            s->stat = Exit;
        }
        //按下F3可以加速
        else if(GetAsyncKeyState(VK_F3))
        {
            if(s->sleeptime > 0)
            {
                s->sleeptime -= 50;
            }
        }
        Sleep(s->sleeptime );
        SnakeRun(s);
        KillSelf(s);
        KillWall(s);
    }while(s->stat == ok);
    GameEnd(s);
    SetPos(18,7);
    printf("哇，你最后的得分是：%d",Grade(s));
}
void KillSelf(Snake* s)
{
    pNode cur = s->pSnake ->next ;
    while(cur != NULL )
    {
        if(s->pSnake ->x == cur->x && s->pSnake ->y == cur->y )
        {
            s->stat = KillBySelf;
            break;
        }
        cur = cur->next ;
    }
}
void KillWall(Snake* s)
{
    if(s->pSnake ->x == 0 || s->pSnake ->x == 56 || s->pSnake ->y == 0 || s->pSnake ->y == 26)
    {
        s->stat = KillByWall;
    }
}
void GameEnd(Snake* s)
{
    SetPos(18,12);
    switch(s->stat)
    {
    case KillBySelf:
        printf("傻子，自己撞死自己了。\n");
        break;
    case KillByWall:
        printf("傻子，被墙撞死了吧。\n");
        break;
    case Exit:
        printf("玩腻了，退出.\n");
        break;
    default:
        break;
    }
}
int Grade(Snake* s)
{
    pNode cur = s->pSnake ;
    int count = 0;
    int t = 0;
    while(cur != NULL)
    {
        ++count;
        cur = cur->next ;
        if(s->sleeptime < 1000)
        {
            t = (1000 - s->sleeptime)/5 ;
        }
    }
    if(t > 0)  //每加速一次，成绩就增加加速次数的2倍
    {
        count = t * 2 + count;
    }
    return (count - 5) ;
}

#include<stdio.h>
#include"snake.h"
#include<time.h>
#include<windows.h>

int main()
{
    Snake s;
    srand(time(NULL));
    ShowWelcome();
    CreateMap();
    InitSnake(&s);
    InitFood(&s) ;
    SnakeRun2(&s);
    printf("\n");
    system("pause");
    return 0;
}