贪吃蛇游戏C语言源代码学习

源代码下载地址为：www.clang.cc

阅读学习了源代码，并做了简单的注释和修改，里面只用了链表数据结构，非常适合C语言入门者学习阅读。

程序可在VS2013下编译运行。

 #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 = , add = ;//总得分与每次吃食物得分。
 int status, sleeptime = ;//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 = ; //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 runGame();
 void initGame();
 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);//返回标准的输入、输出或错误的设备的句柄，也就是获得输入、输出/错误的屏幕缓冲区的句柄
     SetConsoleCursorPosition(hOutput, pos);
 }

 void creatMap()//创建地图
 {
     int i;
     for (i = ; i<; i += )//打印上下边框
     {
         Pos(i, );
         printf("■");//一个方块占两个位置
         Pos(i, );
         printf("■");
     }
     for (i = ; i<; i++)//打印左右边框
     {
         Pos(, i);
         printf("■");
         Pos(, 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 = ;
     tail->y = ;
     tail->next = NULL;
     for (i = ; i <= ; i++)//初始长度为4
     {
         head = (snake*)malloc(sizeof(snake));
         head->next = tail;
         head->x =  +  * i;
         head->y = ;
         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 ;
         }
         self = self->next;
     }
     return ;
 }

 void createFood()//随机出现食物
 {
     snake *food_1;
     srand((unsigned)time(NULL));//为了防止每次产生的随机数相同，种子设置为time
     food_1 = (snake*)malloc(sizeof(snake));
     while ((food_1->x % ) != )    //保证其为偶数，使得食物能与蛇头对其
     {
         food_1->x = rand() %  + ;
     }
     food_1->y = rand() %  + ;
     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 ==  || head->x ==  || head->y ==  || head->y == )
     {
         endGamestatus = ;
         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 - ;
         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 + ;
         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 - ;
         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 + ;
         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() == )       //判断是否会咬到自己
     {
         endGamestatus = ;
         endGame();
     }
 }

 void pause()//暂停
 {
     while ()
     {
         Sleep();
         if (GetAsyncKeyState(VK_SPACE))
         {
             break;
         }

     }
 }

 void runGame()//控制游戏
 {

     Pos(, );
     printf("不能穿墙，不能咬到自己\n");
     Pos(, );
     printf("用↑.↓.←.→分别控制蛇的移动.");
     Pos(, );
     printf("F1 为加速，F2 为减速\n");
     Pos(, );
     printf("ESC ：退出游戏.space：暂停游戏.");
     Pos(, );
     printf("C语言研究中心 www.clang.cc");
     status = R;
     while ()
     {
         Pos(, );
         printf("得分：%d  ", score);
         Pos(, );
         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 = ;
             break;
         }
         else if (GetAsyncKeyState(VK_F1))
         {
             if (sleeptime >= )
             {
                 sleeptime = sleeptime - ;
                 add = add + ;
                 if (sleeptime == )
                 {
                     add = ;//防止减到1之后再加回来有错
                 }
             }
         }
         else if (GetAsyncKeyState(VK_F2))
         {
             if (sleeptime<)
             {
                 sleeptime = sleeptime + ;
                 add = add - ;
                 if (sleeptime == )
                 {
                     add = ;  //保证最低分为1
                 }
             }
         }
         Sleep(sleeptime);
         snakeMove();
     }
 }

 void initGame()//开始界面
 {
     Pos(, );

     system("title C语言研究中心   www.clang.cc");
     printf("欢迎来到贪食蛇游戏！");
     Pos(, );
     printf("              C语言研究中心  www.clang.cc.\n");
     system("pause");
     system("cls");
     Pos(, );
     printf("用↑.↓.←.→分别控制蛇的移动， F1 为加速，2 为减速\n");
     Pos(, );
     printf("加速将能得到更高的分数。\n");
     system("pause");
     system("cls");
 }

 void endGame()//结束游戏
 {

     system("cls");
     Pos(, );
     if (endGamestatus == )
     {
         printf("对不起，您撞到墙了。游戏结束.");
     }
     else if (endGamestatus == )
     {
         printf("对不起，您咬到自己了。游戏结束.");
     }
     else if (endGamestatus == )
     {
         printf("您的已经结束了游戏。");
     }
     Pos(, );
     printf("您的得分是%d\n", score);
     while (getchar() != 'y')
     {
         printf("close?[y]");
     }
     exit();
 }

 void gameStart()//游戏初始化
 {
     system("mode con cols=100 lines=30");
     initGame();
     creatMap();
     initSnake();
     createFood();
 }

 int main()
 {
     gameStart();
     runGame();
     endGame();
     return ;
 }

原博客地址：http://www.cnblogs.com/jacklu/p/5214692.html