C++贪吃蛇

#include<iostream>
#include<cstdio>
#include<cstdlib>
#include<ctime>
#include<conio.h>
using namespace std;
typedef struct{ int x, y; }Point;
char map[22][22];                                          //定义一个22*22的地图（含边界）
Point snake[400], food, Next;                     //定义蛇、食物、下一步蛇头的位置
int head, tail;                                                 //用于储存蛇头和蛇尾的下标
int grade, length, autotime;                     //游戏等级、蛇长、自动前进所需时间
char direction;                                                 //前进方向
//用inline定义内联函数节省程序运行时的调用开销
//刷新地图
inline void Update(char map[][22], int grade, int length, int autotime)
{
       system("cls");                                          //清屏
       int i, j;
       printf("\n");
       for (i = 0; i < 22; i++)
       {
              printf("\t");
              for (j = 0; j < 22; j++)
                     printf("%c ", map[i][j]);
              if (i == 0)
                     printf("\t等级为：%d", grade);
              if (i == 2)
                     printf("\t长度为：%d", length);
              if (i == 6)
                     printf("\t前进速度为：%d", autotime);
              printf("\n");
       }
}
//欢迎界面
inline void hello()
{
       puts("\n\n\n\t\t\t贪吃蛇游戏即将开始！请使用方向键开始游戏！");                                          //准备开始
       double start;
       for (int i = 1; i >= 0; i--)
       {
              start = (double)clock() / CLOCKS_PER_SEC;                            //得到程序目前为止运行的时间
              while ((double)clock() / CLOCKS_PER_SEC - start <= 1);       //经过1秒之后
              if (i)
              {
                     system("cls");                                                                      //清屏
                     printf("\n\n\n\t\t\t进入倒计时：%d\n", i);                            //倒计时
              }
              else
                     Update(map, grade, length, autotime);                            //刷新地图
       }
}
//随机生成食物位置
inline void f()
{
       srand(int(time(0)));                                                                      //调用种子函数
       do{
              food.x = rand() % 20 + 1;
              food.y = rand() % 20 + 1;
       } while (map[food.x][food.y] != ‘ ‘);
       map[food.x][food.y] = ‘!‘;                                                               //食物为“!”
}
//初始化
inline void init()
{
       int i, j;
       for (i = 1; i <= 20; i++)
              for (j = 1; j <= 20; j++)
                     map[i][j] = ‘ ‘;
       for (i = 0; i <= 21; i++)
              map[0][i] = map[21][i] = map[i][0] = map[i][21] = ‘*‘;       //边界
       map[1][1] = map[1][2] = ‘O‘;                                          //蛇身（含蛇尾）
       map[1][3] = ‘@‘;                                                      //蛇头
       head = 2; tail = 0;                                                   //开始时头和尾的下标
       snake[head].x = 1; snake[head].y = 3;                                //开始时蛇头在地图上的下标
       snake[tail].x = 1; snake[tail].y = 1;                                //开始时蛇尾在地图上的下标
       snake[1].x = 1; snake[1].y = 2;                                     //开始时蛇身在地图上的下标
       f();                                                                 //随机生成食物位置
       grade = 1; length = 3; autotime = 500;                               //开始的等级、长度、自动前进时间
       direction = 77;                                                      //初始的运动方向向右
}
//预前进
inline int GO()
{
       bool timeover = true;
       double start = (double)clock() / CLOCKS_PER_SEC;                     //得到程序目前为止运行的时间
       //自动经过1秒或者等待1秒内的键盘输入
       while ((timeover = ((double)clock() / CLOCKS_PER_SEC - start <= autotime / 1000.0)) && !_kbhit());
       //键盘输入

       if (timeover)
       {
              _getch();
              direction = _getch();                                                               //获取方向
       }
       switch (direction)
       {
       case 72:
              Next.x = snake[head].x - 1; Next.y = snake[head].y;              //向上
              break;
       case 80:
              Next.x = snake[head].x + 1; Next.y = snake[head].y;              //向下
              break;
       case 75:
              Next.x = snake[head].x; Next.y = snake[head].y - 1;              //向左
              break;
       case 77:
              Next.x = snake[head].x; Next.y = snake[head].y + 1;              //向右
              break;
       default:
              puts("\tGame over!");                                                               //按下非方向键游戏失败
              return 0;
       }
       if (Next.x == 0 || Next.x == 21 || Next.y == 0 || Next.y == 21)                     //撞到边界
       {
              puts("\tGame over!");
              return 0;
       }
       if (map[Next.x][Next.y] != ‘ ‘&&!(Next.x == food.x&&Next.y == food.y))       //吃到自己
       {
              puts("\tGame over!");
              return 0;
       }
       if (length == 400)                                                                                                  //最长蛇长
       {
              puts("\tGood game!");
              return 0;
       }
       return 1;
}
//吃到食物
inline void EAT()
{
       length++;                                                                      //长度增加1
       int _grade = length / 10 + 1;                                   //计算等级
       if (_grade != grade)
       {
              grade = _grade;
              if (autotime >= 100)
                     autotime = 550 - grade * 50;                     //增加一级自动时间减短50毫秒
       }
       map[Next.x][Next.y] = ‘@‘;                                          //蛇头位置变化
       map[snake[head].x][snake[head].y] = ‘O‘;              //原蛇头位置变化为蛇身
       head = (head + 1) % 400;                                          //蛇头下标加1
       snake[head].x = Next.x; snake[head].y = Next.y;       //蛇头下标变化
       f();                                                                             //随机生成食物位置
       Update(map, grade, length, autotime);                     //刷新地图
}
//没吃到食物
inline void FAILURE()
{
       map[snake[tail].x][snake[tail].y] = ‘ ‘;              //蛇尾原来的位置变成“ ”
       tail = (tail + 1) % 400;                                          //蛇尾下标加1
       map[Next.x][Next.y] = ‘@‘;                                          //蛇头位置变化
       map[snake[head].x][snake[head].y] = ‘O‘;              //原蛇头位置变化为蛇身
       head = (head + 1) % 400;                                          //蛇头下标加1
       snake[head].x = Next.x;                                                 //蛇头下标变化
       snake[head].y = Next.y;
       Update(map, grade, length, autotime);                     //刷新地图
}
//main函数
int main()
{
       init();                                   //初始化
       hello();                            //欢迎界面
       while (1)
       {
              if (GO())                     //预前进
              {
                     if (Next.x == food.x&&Next.y == food.y)
                            EAT();              //吃到食物
                     else
                            FAILURE();       //没吃到食物
              }
              else
                     return 0;              //失败或者胜利，游戏结束
       }
       return 0;
}