C语言所写的简单的贪吃蛇代码

才刚开始学习不久，学到链表之后老师布置了这个任务，用了很多不太熟悉的函数，例如WINDOWS.H中的定位光标，暂停、清空面板、改变面板大小等。
之后我会慢慢加上注释。
#include<stdio.h>
#include<stdlib.h>

#include<time.h>
#include<windows.h>
#define U 1
#define D 2
#define L 3
#define R 4
void Pos();
void creatmap();
void creatsnake();
int biteself();
void creatfood();
void cantcrosswall();
void snakemove();
void welcometogame();
void gamestart();
void caozuo();
typedef struct snake
{
int x;
int y;
struct snake *next;
}snake;
int score=0,add=10,maxscore=0;
int status,sleeptime=200;
snake *head,*food;
snake *q;
int endgamestatus=0;
void Pos(int x,int y)
{
COORD pos;
HANDLE hOutput;
pos.X=x;
pos.Y=y;
hOutput=GetStdHandle(STD_OUTPUT_HANDLE);
SetConsoleCursorPosition(hOutput,pos);
}
void creatmap()
{
int i;
for(i=0;i<58;i+=2)
{
Pos(i,0);
printf("■");
Pos(i,26);
printf("■");
}
for(i=1;i<26;i++)
{
Pos(0,i);
printf("■");
Pos(56,i);
printf("■");
}
}
void creatsnake()
{
snake *tail;
int i;
tail=(snake*)malloc(sizeof(snake));
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;
}
Pos(tail->x,tail->y);
printf("⊙");
tail=tail->next;
while(tail!=NULL)
{
Pos(tail->x,tail->y);
printf("●");
tail=tail->next;
}
}
int biteself()
{
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 creatfood()
{
snake *food_1;
srand((unsigned)time(NULL));
food_1=(snake*)malloc(sizeof(snake));
while(food_1->x%2!=0)
{
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)
{
free(food_1);
creatfood();
}
q=q->next;
}
Pos(food_1->x,food_1->y);
food=food_1;
printf("◎");
}
void cantcrosswall()
{
if(head->x==0 || head->x==56 ||head->y==0 || head->y==26)
{
endgamestatus=1;
}
}
void snakemove()
{
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)
{
nexthead->next=head;
head=nexthead;
q=head;
Pos(q->x,q->y);
printf("⊙");
q=q->next;
while(q!=NULL)
{
Pos(q->x,q->y);
printf("●");
q=q->next;
}
score=score+add;
creatfood();
}
else
{
nexthead->next=head;
head=nexthead;
q=head;
Pos(q->x,q->y);
printf("⊙");
q=q->next;
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)
{
nexthead->next=head;
head=nexthead;
q=head;
Pos(q->x,q->y);
printf("⊙");
q=q->next;
while(q!=NULL)
{
Pos(q->x,q->y);
printf("●");
q=q->next;
}
score=score+add;
creatfood();
}
else
{
nexthead->next=head;
head=nexthead;
q=head;
Pos(q->x,q->y);
printf("⊙");
q=q->next;
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)
{
nexthead->next=head;
head=nexthead;
q=head;
Pos(q->x,q->y);
printf("⊙");
q=q->next;
while(q!=NULL)
{
Pos(q->x,q->y);
printf("●");
q=q->next;
}
score=score+add;
creatfood();
}
else
{
nexthead->next=head;
head=nexthead;
q=head;
Pos(q->x,q->y);
printf("⊙");
q=q->next;
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)
{
nexthead->next=head;
head=nexthead;
q=head;
Pos(q->x,q->y);
printf("⊙");
q=q->next;
while(q!=NULL)
{
Pos(q->x,q->y);
printf("●");
q=q->next;
}
score=score+add;
creatfood();
}
else
{
nexthead->next=head;
head=nexthead;
q=head;
Pos(q->x,q->y);
printf("⊙");
q=q->next;
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)
{
endgamestatus=2;
}
}
void pause()
{
while(1)
{
Sleep(300);
if(GetAsyncKeyState(VK_SPACE))
{
break;
}
}
}

void welcometogame()
{
Pos(40,12);
printf("欢迎来到贪食蛇游戏！");
Pos(40,25);
system("pause");
system("cls");
}

void caozuo()
{
Pos(64,16);
printf("你可以用↑.↓.←.→分别控制蛇的移动.");
Pos(64,18);
printf("ESC ：退出游戏.space：暂停游戏.");
Pos(64,20);
printf("F1:减慢蛇的运动速度 F2：加快它的速度");
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);
Pos(64,12);
printf("最高分：%d分",maxscore);
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;
}
}
}
else if(GetAsyncKeyState(VK_F2))
{
if(sleeptime<350)
{
sleeptime=sleeptime+30;
add=add-2;
if(sleeptime==350)
{
add=1;
}
}
}
Sleep(sleeptime);
snakemove();
if(endgamestatus!=0)
{
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("您结束了游戏。");
}
Pos(24,13);
if(maxscore<score)
{
printf("恭喜你打破了记录并成为了最高分！");
maxscore= score;
}
Pos(24,14);
printf("您的得分是%d\n",score);
endgamestatus=0;
system("pause");
break;
}
}
}
void gamestart()
{
system("mode con cols=100 lines=30");
welcometogame();
creatmap();
creatsnake();
creatfood();
}
int main()
{
while(1)
{
gamestart();
caozuo();
}
return 0;
}