c语言贪吃蛇代码及解析？
#include<stdio.h
#include<time.h
#include<windows.h
#include<stdlib.h
#define U 1
#define D 2
#define L 3
#define R 4 //蛇的状态，U：上 ；D：下；L:左 R：右
typedef struct SNAKE //蛇身的一个节点
{
int x;
int y;
struct SNAKE *next;
}snake;
//全局变量//
int score=0,add=10;//总得分与每次吃食物得分。
int status,sleeptime=200;//每次运行的时间间隔
snake *head, *food;//蛇头指针，食物指针
snake *q;//遍历蛇的时候用到的指针
int endgamestatus=0; //游戏结束的情况，1：撞到墙；2：咬到自己；3：主动退出游戏。
//声明全部函数//
void Pos();
void creatMap();
void initsnake();
int biteself();
void createfood();
void cantcrosswall();
void snakemove();
void pause();
void gamecircle();
void welcometogame();
void endgame();
void gamestart();
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 creatMap()//创建地图
{
int i;
for(i=0;i<58;i+=2)//打印上下边框
{
Pos(i,0);
printf("■");
Pos(i,26);
printf("■");
}
for(i=1;i<26;i++)//打印左右边框
{
Pos(0,i);
printf("■");
Pos(56,i);
printf("■");
}
}
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;
}
}
int biteself()//判断是否咬到了自己
{
snake *self;
self=head-next;
while(self!=NULL)
{
if(self-x==head-x && self-y==head-y)
{
return 1;
}
self=self-next;
}
return 0;
}
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("■");
}
void cantcrosswall()//不能穿墙
{
if(head-x==0 || head-x==56 ||head-y==0 || head-y==26)
{
endgamestatus=1;
endgame();
}
}
void snakemove()//蛇前进,上U,下D,左L,右R
{
snake * nexthead;
cantcrosswall();
nexthead=(snake*)malloc(sizeof(snake));
if(status==U)
{
nexthead-x=head-x;
nexthead-y=head-y-1;
if(nexthead-x==food-x && nexthead-y==food-y)//如果下一个有食物//
{
nexthead-next=head;
head=nexthead;
q=head;
while(q!=NULL)
{
Pos(q-x,q-y);
printf("■");
q=q-next;
}
score=score+add;
createfood();
}
else //如果没有食物//
{
nexthead-next=head;
head=nexthead;
q=head;
while(q-next-next!=NULL)
{
Pos(q-x,q-y);
printf("■");
q=q-next;
}
Pos(q-next-x,q-next-y);
printf(" ");
free(q-next);
q-next=NULL;
}
}
if(status==D)
{
nexthead-x=head-x;
nexthead-y=head-y+1;
if(nexthead-x==food-x && nexthead-y==food-y) //有食物
{
nexthead-next=head;
head=nexthead;
q=head;
while(q!=NULL)
{
Pos(q-x,q-y);
printf("■");
q=q-next;
}
score=score+add;
createfood();
}
else //没有食物
{
nexthead-next=head;
head=nexthead;
q=head;
while(q-next-next!=NULL)
{
Pos(q-x,q-y);
printf("■");
q=q-next;
}
Pos(q-next-x,q-next-y);
printf(" ");
free(q-next);
q-next=NULL;
}
}
if(status==L)
{
nexthead-x=head-x-2;
nexthead-y=head-y;
if(nexthead-x==food-x && nexthead-y==food-y)//有食物
{
nexthead-next=head;
head=nexthead;
q=head;
while(q!=NULL)
{
Pos(q-x,q-y);
printf("■");
q=q-next;
}
score=score+add;
createfood();
}
else //没有食物
{
nexthead-next=head;
head=nexthead;
q=head;
while(q-next-next!=NULL)
{
Pos(q-x,q-y);
printf("■");
q=q-next;
}
Pos(q-next-x,q-next-y);
printf(" ");
free(q-next);
q-next=NULL;
}
}
if(status==R)
{
nexthead-x=head-x+2;
nexthead-y=head-y;
if(nexthead-x==food-x && nexthead-y==food-y)//有食物
{
nexthead-next=head;
head=nexthead;
q=head;
while(q!=NULL)
{
Pos(q-x,q-y);
printf("■");
q=q-next;
}
score=score+add;
createfood();
}
else //没有食物
{
nexthead-next=head;
head=nexthead;
q=head;
while(q-next-next!=NULL)
{
Pos(q-x,q-y);
printf("■");
q=q-next;
}
Pos(q-next-x,q-next-y);
printf(" ");
free(q-next);
q-next=NULL;
}
}
if(biteself()==1) //判断是否会咬到自己
{
endgamestatus=2;
endgame();
}
}
void pause()//暂停
{
while(1)
{
Sleep(300);
if(GetAsyncKeyState(VK_SPACE))
{
break;
}
}
}
void gamecircle()//控制游戏
{
Pos(64,15);
printf("不能穿墙，不能咬到自己\");
Pos(64,16);
printf("用↑.↓.←.→分别控制蛇的移动.");
Pos(64,17);
printf("F1 为加速，F2 为减速\");
Pos(64,18);
printf("ESC ：退出游戏.space：暂停游戏.");
Pos(64,20);
printf("c语言研究中心 www.dotcpp.com");
status=R;
while(1)
{
Pos(64,10);
printf("得分：%d ",score);
Pos(64,11);
printf("每个食物得分：%d分",add);
if(GetAsyncKeyState(VK_UP) && status!=D)
{
status=U;
}
else if(GetAsyncKeyState(VK_DOWN) && status!=U)
{
status=D;
}
else if(GetAsyncKeyState(VK_LEFT)&& status!=R)
{
status=L;
}
else if(GetAsyncKeyState(VK_RIGHT)&& status!=L)
{
status=R;
}
else if(GetAsyncKeyState(VK_SPACE))
{
pause();
}
else if(GetAsyncKeyState(VK_ESCAPE))
{
endgamestatus=3;
break;
}
else if(GetAsyncKeyState(VK_F1))
{
if(sleeptime=50)
{
sleeptime=sleeptime-30;
add=add+2;
if(sleeptime==320)
{
add=2;//防止减到1之后再加回来有错
}
}
}
else if(GetAsyncKeyState(VK_F2))
{
if(sleeptime<350)
{
sleeptime=sleeptime+30;
add=add-2;
if(sleeptime==350)
{
add=1; //保证最低分为1
}
}
}
Sleep(sleeptime);
snakemove();
}
}
void welcometogame()//开始界面
{
Pos(40,12);
system("title c语言研究中心 www.dotcpp.com");
printf("欢迎来到贪食蛇游戏！");
Pos(40,25);
system("pause");
system("cls");
Pos(25,12);
printf("用↑.↓.←.→分别控制蛇的移动， F1 为加速，2 为减速\");
Pos(25,13);
printf("加速将能得到更高的分数。\");
system("pause");
system("cls");
}
void endgame()//结束游戏
{
system("cls");
Pos(24,12);
if(endgamestatus==1)
{
printf("对不起，您撞到墙了。游戏结束.");
}
else if(endgamestatus==2)
{
printf("对不起，您咬到自己了。游戏结束.");
}
else if(endgamestatus==3)
{
printf("您的已经结束了游戏。");
}
Pos(24,13);
printf("您的得分是%d\",score);
exit(0);
}
void gamestart()//游戏初始化
{
system("mode con cols=100 lines=30");
welcometogame();
creatMap();
initsnake();
createfood();
}
int main()
{
gamestart();
gamecircle();
endgame();
return 0;
}