#include<stdio.h>
    #include<time.h>
    #include<conio.h>
    #include<stdlib.h>
    int head=3 ,tail=0;
    int main()
    {
    int i,j,k=0;
    int zuobiao[2][80];
    long start;
    int direction=77;
    int gamespeed;
    int timeover;
    int change(char qipan[20][80],int zuobiao[2][80],char direction);
    zuobiao[0][tail]=1;zuobiao[1][tail]=1;zuobiao[0][1]=1;zuobiao[1][1]=2;zuobiao[0][2]=1;zuobiao[1][2]=3;zuobiao[0][head]=1;zuobiao[1][head]=4;
    /*处理棋盘*/
    char qipan[20][80];//定义棋盘
    for(i=0;i<20;i++)
    for(j=0;j<80;j++)
    qipan[i][j]=' ';//初始化棋盘
    for(i=0;i<80;i++)
    qipan[0][i]='_';
    for(i=0;i<20;i++)
    qipan[i][0]='|';
    for(i=0;i<20;i++)
    qipan[i][79]='|';
    for(i=0;i<80;i++)
    qipan[19][i]='_';
    qipan[1][1]=qipan[1][2]=qipan[1][3]='*';//初始化蛇的位置
    qipan[1][4]='#';
    printf("This is a game of a SNAKE.\nGOOD LUCK TO YOU !\n");
    printf("Input your game speed,please.(e.g.300)\n");
    scanf("%d",&gamespeed);
    
    while(direction!='q')
    {
    system("cls");
    for(i=0;i<20;i++)//打印出棋盘
    for(j=0;j<80;j++)
    printf("%c",qipan[i][j]);
    timeover=1;
    start=clock();
    while(!kbhit()&&(timeover=clock()-start<=gamespeed));
    if(timeover)
    {
    getch();
    direction=getch();
    }
    else
    direction=direction;
    if(!(direction==72||direction==80||direction==75||direction==77))
    {
    return 0;
    system("cls");
    printf("GAME OVER!\n");
    }
    if(!change(qipan,zuobiao,direction))
    {
    direction='q';
    system("cls");
    printf("GAME OVER!\n");
    }
    }
    return 0;
    }
    int change(char qipan[20][80],int zuobiao[2][80],char direction)
    {
    int x,y;
    if(direction==72)
    x=zuobiao[0][head]-1;y=zuobiao[1][head];
    if(direction==80)
    x=zuobiao[0][head]+1;y=zuobiao[1][head];
    if(direction==75)
    x=zuobiao[0][head];y=zuobiao[0][head]-1;
    if(direction==77)
    x=zuobiao[0][head];y=zuobiao[1][head]+1;
    if(x==0||x==18||y==78||y==0)
    return 0;
    if(qipan[x][y]!=' ')
    return 0;
    qipan[zuobiao[0][tail]][zuobiao[1][tail]]=' ';
    tail=(tail+1)%80;
    qipan[zuobiao[0][head]][zuobiao[1][head]]='*';
    head=(head+1)%80;
    zuobiao[0][head]=x;
    zuobiao[1][head]=y;
    qipan[zuobiao[0][head]][zuobiao[1][head]]='#';
    return 1;
    }