C语言之贪吃蛇

利用链表的贪吃蛇，感觉自己写的时候还是有很多东西不熟悉，

1.预编译

2.很多关于系统的头文件也不是很熟悉

3.关于内存

第一个是.h头文件

#ifndef _SNAKE_H_H_H
#define _SNAKE_H_H_H


//调节游戏界面大小，这里设置为15*15
int const COL=15;
int const ROW=15;

//蛇结点
typedef struct  Node
{
	//data域
	int x;
	int y;
	
	//指针域
	struct  Node* pre;
	struct  Node* next;
}NODE,*pNODE;

//食物
typedef struct  Food
{
	int x;
	int y;
	char c;
}FOOD,*pFOOD;


//初始化函数

	//初始化蛇链表，创建蛇的第一节
pNODE InitSnake();

	//初始化食物
FOOD InitFood(void);

//其它函数

	//蛇运动函数
int MoveSnake(pNODE pHead,char c);

	//检查键盘按键
char KbHit(char orient);//函数重载

	//蛇吃到食物时的处理函数
pNODE SnakeEatFood(pNODE pHead,pFOOD pFood);

	//打印游戏界面函数
void Print(pNODE pHead,FOOD food);

	//游戏结束，释放内存函数
void FreeMemory(pNODE *ppHead);

#endif

　　

第二个是.cpp文件

#include "stdafx.h"
#include<stdio.h>
#include<stdlib.h>
#include<time.h>
#include<conio.h>//windows/dos界面下可以用来生成一些漂亮的字符，另外getchar(),getch()等函数包含在其中
#include<Windows.h>
#include"Snake.h"

//主函数
int main(void)
{
	char orien = 'a', get_char;
	int game_over = 0;

	FOOD food = InitFood();
	pNODE head = InitSnake();

	while (1)
	{
		head = SnakeEatFood(head, &food);
		get_char = KbHit(orien);
		if (27 == get_char)
		{
			game_over = 1;
			break;
		}
		else
			orien = get_char;	
		game_over = MoveSnake(head, orien);
		if (game_over)
			break;
		
		system("cls");
		Print(head, food);
		Sleep(200); //ms级，刷屏间隔时间
	}
	if (game_over)
	{
		printf("游戏结束！
");

		FreeMemory(&head);
		if (NULL == head)
			printf("内存释放成功！
");
		else
			printf("内存释放失败！
");
	}
	_getch();
	return 0;
}
//初始化，创建蛇的第一节
pNODE InitSnake(void)
{
	pNODE pHead = (pNODE)malloc(sizeof(NODE));
	srand((unsigned)(time(NULL)+1));

	if (NULL == pHead)
	{
		printf("内存分配失败！
");
		exit(-1);
	}
	
	pHead->x = rand() % ROW;
	pHead->y = rand() % COL;
	pHead->next = NULL;
	pHead->pre = NULL;

	return pHead;
}
//初始化食物成员
FOOD InitFood(void)
{
	FOOD food;
	srand((unsigned)time(NULL));

	food.x = rand() % ROW;
	food.y = rand() % COL;
	food.c = 65 + rand()%26;

	return food;
}
//蛇吃到食物处理函数
pNODE SnakeEatFood(pNODE pHead, pFOOD pFood)
{
	pNODE p_add = NULL, pt = NULL, rear = NULL;
	
	if (pFood->x == pHead->x && pFood->y == pHead->y)
	{
		p_add = (pNODE)malloc(sizeof(NODE));
		if (NULL == p_add)
		{
			printf("内存分配失败！
");
			exit(-1);
		}

		pt = pHead;
		while (pt->next != NULL)
		{
			pt = pt->next;
		}
		p_add->pre = pt;
		p_add->next = NULL;
		pt->next = p_add;

		*pFood = InitFood();
		//不让食物出现在蛇的位置上
		pt = pHead;
		while (pt != NULL)
		{
			if (pFood->x == pHead->x && pFood->y == pHead->y)
			{
				*pFood = InitFood();
				break;
			}
			pt = pt->next;
		}
	}

	return pHead;
}
//检查键盘按键
char KbHit(char orient)
{	
	char c;

	if (_kbhit())
	{
		c = _getch();	
		if (orient != 'd' && c == 'a')
		{
			orient = c;
		}
		else if (orient != 'a' && c == 'd')
		{
			orient = c;
		}
		else if (orient != 'w' && c == 's')
		{
			orient = c;
		}
		else if (orient != 's' && c == 'w')
		{
			orient = c;
		}
		else if (27 == c)
		{
			orient = c;
		}
	}

	return orient;
}
//蛇运动函数
int MoveSnake(pNODE pHead, char c)
{
	INT game_over = 0;
	pNODE pt = pHead;

	//让pt指向蛇尾
	while (pt->next != NULL)
	{
		pt = pt->next;
	}

	//从蛇尾向向蛇头前进
	while(pt != pHead)
	{
		pt->x = pt->pre->x;
		pt->y = pt->pre->y;
		pt = pt->pre;
	}

	if ('d' == c)
	{
		pHead->x += 1;
		if (pHead->x >= ROW)
		{
			pHead->x -= ROW;
		}
	}

	if ('a' == c)
	{
		pHead->x -= 1;
		if (pHead->x < 0)
		{
			pHead->x += ROW;
		}
	}
	
	if ('s' == c)
	{
		pHead->y += 1;
		if (pHead->y >= COL)
		{
			pHead->y -= COL;
		}
	}

	if ('w' == c)
	{
		pHead->y -= 1;
		if (pHead->y < 0)
		{
			pHead->y += COL;
		}
	}

	//当蛇头碰到蛇身，游戏结束
	pt = pHead->next;
	while (pt != NULL)
	{
		if (pt->x == pHead->x && pt->y == pHead->y)
		{
			game_over = 1;
		}
		pt = pt->next;
	}

	return game_over;
}
//打印游戏界面函数
void Print(pNODE pHead, FOOD food)
{
	int row = 0, col = 0, flag = 0;
	pNODE pt = NULL;

	printf("  方向控制——上:w 下:s 左:a 右:d(Esc退出)
  ");
	for (row=0; row<ROW; row++)
	{
		printf("—");
	}
	putchar('
');

	for (col=0; col<COL; col++)
	{
		printf(" |");
		for (row=0; row<ROW; row++)
		{
			pt = pHead;
			flag = 0;
			//打印出蛇
			while (pt != NULL)
			{
				if (row == pt->x && col == pt->y)
				{
					if (pt == pHead)
						printf("■");
					else
						printf("□");
					flag = 1;
					break;
				}
				pt = pt->next;
			}
			//打印出食物或两个空格
			if (0 == flag)
			{
				if (row == food.x && col == food.y)
				{
					putchar(food.c);
					putchar(food.c);
					continue;
				}
				printf("  ");
			}		
		}
		printf("|");
		putchar('
');
	}
	
	printf("  ");
	for (row=0; row<ROW; row++)
	{
		printf("—");
	}
	putchar('
');
}
//释放内存函数
void FreeMemory(pNODE *ppHead)
{
	pNODE p_delete = NULL, pt = NULL;

	while (*ppHead != NULL)
	{
		pt = (*ppHead)->next;
		if (pt != NULL)
		{
			pt->pre = NULL;
		}	
		p_delete = *ppHead;
		free(p_delete);
		p_delete = NULL;
		*ppHead = pt;
	}
}