C語言貪吃蛇

編譯環境：vs 2019
成像圖

接下來請看代碼和注釋：

//這里有一些是多余的
#include<stdio.h>
#include<stdlib.h>
#include<windows.h>
#include<conio.h>
#include<time.h>
#include<string.h>
#include<ctype.h>
#include<math.h>
#include<signal.h>
#include<errno.h>
#include<stdarg.h>
#include<setjmp.h>
#include<graphics.h>//需安裝easy_X,幾秒鐘的事

typedef struct  {
	int x, y;
}point;//坐標xy，與數學的坐標略有不同
struct snake {
	point xy[100];
	int position;
	int lenth;
}snake;
struct food {
	int flag=0;//判斷食物是否存在
	point fdxy;
	int grade=0;
}food;

enum position{ up, down, left, right };//列舉

//蛇，初始化蛇的位置
void startsnake()
{
	//蛇頭
	snake.xy[0].x = 20;
	snake.xy[0].y = 0;

	snake.xy[1].x = 10;
	snake.xy[1].y = 0;

	snake.xy[2].x = 0;
	snake.xy[2].y = 0;
	
	//蛇初始化方向
	snake.position = right;

	snake.lenth = 3;
}

//畫蛇（要安裝easy_X），顏色會不斷變化
void drawsnake()
{
	for (int i = 0; i < snake.lenth; i++)
	{
		setfillcolor(RGB(rand() % 255, rand() % 255, rand() % 255));
		fillrectangle(snake.xy[i].x, snake.xy[i].y, snake.xy[i].x + 10, snake.xy[i].y + 10);
	}
}

void movesnake()
{
	//蛇身往前移動一格
	for (int i = snake.lenth - 1; i > 0; i--)
	{
		snake.xy[i].x = snake.xy[i - 1].x;
		snake.xy[i].y = snake.xy[i - 1].y;
	}
	//蛇頭方向移動
	switch (snake.position)
	{
	case up:
		snake.xy[0].y = snake.xy[0].y - 10; break;
	case down:
		snake.xy[0].y = snake.xy[0].y + 10; break;
	case left:
		snake.xy[0].x = snake.xy[0].x - 10; break;
	case right:
		snake.xy[0].x = snake.xy[0].x + 10; break;
	}
}

//隨機生成食物
void showfood()
{
	food.fdxy.x = rand() % 60 * 10;//0~590
	food.fdxy.y = rand() % 40 * 10;//0~390
	//回圈用于判斷是否與蛇重合
	for (int i = 0; i < snake.lenth; i++)
	{
		if (snake.xy[i].x == food.fdxy.x && snake.xy[i].y == food.fdxy.y)
		{
			food.fdxy.x = rand() % 60 * 10;
			food.fdxy.y = rand() % 40 * 10;
		}
	}
}
//
void drawfood()
{
	setfillcolor(RGB(rand() % 255, rand() % 255, rand() % 255));
	fillrectangle(food.fdxy.x, food.fdxy.y, food.fdxy.x + 10, food.fdxy.y + 10);
}

void eatfood()
{
	if (snake.xy[0].x == food.fdxy.x && snake.xy[0].y == food.fdxy.y)
	{
		snake.lenth++;
		food.flag = 0;//這里看下main函式
		food.grade += 10;
	}
}

//鍵盤操作
void keydown()
{
	char dqown = _getch();
	switch (dqown)
	{
	case 'W':
	case 'w':
		if (snake.position != down)
			snake.position = up;
		break;
	case 'A':
	case 'a':
		if (snake.position != right)
			snake.position = left;
		break;
	case 'S':
	case 's':
		if (snake.position != up)
			snake.position = down;
		break;
	case 'D':
	case 'd':
		if (snake.position != left)
			snake.position = right;
		break;
	case '9':Sleep(5000);//按下 9 暫停 5 秒 (可自行更改)
	}
}

void showgrade()
{
	char Grade[20] = "";
	sprintf_s(Grade, "grade:%d", food.grade);
	outtextxy(250, 20, Grade);
}

//撞墻則死，碰自己不死
void dead()
{
	if (snake.xy[0].x== 600 || snake.xy[0].x<0 || snake.xy[0].y<0|| snake.xy[0].y == 400)
	{
		char over[20] = "Game Over!";
		outtextxy(250, 50,over);
		system("pause");
		exit(0);
	}
		
}

int main()
{
	srand((unsigned int)time(NULL));//播種
	initgraph(600, 400); //畫面大小，可自行隨意更改
	setbkcolor(RGB(110, 120, 119));//背景顏色
	
	//初始化蛇
	startsnake(); 
	drawsnake();
	
	while(1)
	{
		cleardevice();//清屏
		movesnake();
		drawsnake();
		if (food.flag == 0)//判斷是否生成食物
		{
			showfood();
			food.flag = 1;
		}
		drawfood();
		if (_kbhit())//判斷是否鍵盤操作
		{
			keydown();
		}
		eatfood();
		showgrade();
		dead();
		Sleep(100);//這個可以看作蛇的移動速度
	}
	return 0;
}