C++贪吃蛇源码，小白专用

【核心代码】

#include <graphics.h>//图形库头文件
#include <conio.h>//按键相关头文件
#include <time.h>

#define MAX 1000 //蛇最大的节数
#define SIZE 20 //蛇的尺寸

HWND hwnd;

struct COOR{//坐标
	int x;
	int y;
};

enum Ch{up=72,down=80,left=75,right=77};//上下左右

struct Snake{
	int n;//代表蛇的节数
	COOR scr[MAX];
	Ch ch;//蛇的方向
}snake;

struct Food{
	COOR fcr;//代表食物的坐标
	int flag;//代表食物是否被吃掉
}food;

void initGame(){
	initgraph(640, 480);
	//蛇的节数为1
	snake.n = 1;
	//蛇头
	snake.scr[0].x = 0;
	snake.scr[0].y = 0;
	//向右
	snake.ch = right;

	food.flag = 0;//没有食物

}
//绘制蛇
void snakePaint(){
	//蛇头
	   fillrectangle(snake.scr[0].x, snake.scr[0].y, snake.scr[0].x   SIZE, snake.scr[0].y   SIZE);
	//蛇身
	for (int i = snake.n-1; i > 0; i--){
	  fillrectangle(snake.scr[i].x, snake.scr[i].y, snake.scr[i].x   SIZE, snake.scr[i].y   SIZE);
	}
}
//蛇的移动
void snakeMove(){
	for (int i = snake.n - 1; i > 0; i--){
		snake.scr[i].x = snake.scr[i - 1].x;
		snake.scr[i].y = snake.scr[i - 1].y;
	}
	switch (snake.ch){
	case up:
		snake.scr[0].y -= SIZE;
		break;
	case down:
		snake.scr[0].y  = SIZE;
		break;
	case left:
		snake.scr[0].x -= SIZE;
		break;
	case right:
		snake.scr[0].x  = SIZE;
		break;
	default:break;
	}
}
void changeSnakeCh(){
	switch (getch()){
	case 72://向上的
		if (snake.ch != down)
			snake.ch = up;
		break;
	case 80://向下的
		if (snake.ch != up)
			snake.ch = down;
		break;
	case 75://向左的
		if (snake.ch != right)
			snake.ch = left;
		break;
	case 77://向右的
		if (snake.ch != left)
			snake.ch =right ;
		break;
	}
}

//食物的坐标
void FoodCoor(){
	//随机数种子
	srand((unsigned)time(NULL));

	food.fcr.x = rand() % 32 * SIZE; //0-31  0-620
	food.fcr.y = rand() % 24 * SIZE;

	food.flag = 1;//生成食物
}
//画食物
void FoodPaint(){
	roundrect(food.fcr.x, food.fcr.y, food.fcr.x   SIZE, food.fcr.y   SIZE, 10, 10);
}
//蛇吃食物
void EatFood(){
	//吃食物

	if (snake.scr[0].x == food.fcr.x&&snake.scr[0].y == food.fcr.y){
		food.flag = 0;//吃掉食物,消失
		snake.n  ;
	}
}
//判断输
void GameOver(){
	hwnd = GetHWnd();//窗口置前
	//蛇头撞到了墙
	if (snake.scr[0].x<0 || snake.scr[0].x>620 || snake.scr[0].y<0 || snake.scr[0].y>460){
		if (snake.scr[0].x<0 || snake.scr[0].x>620 || snake.scr[0].y<0 || snake.scr[0].y>460
	//蛇头撞到蛇身
	for (int i = snake.n - 1; i > 0; i--){
		if (snake.scr[0].x == snake.scr[i].x&&snake.scr[0].y == snake.scr[i].y){
			MessageBox(hwnd, L"游戏结束", L"提示", MB_OK);
			exit(0);
		}
	}
}
//主函数
int main(){

	initGame();
	
	while (1){
		while (!kbhit()){//检测按键是否按下
			if (food.flag == 0)
			FoodCoor();//食物的坐标
			cleardevice();//刷新屏幕
			FoodPaint();//绘制食物
			snakeMove();//蛇的移动
			snakePaint();//绘制蛇

			Sleep(200);
			EatFood();//蛇吃食物
			GameOver();
		}
		changeSnakeCh();//改变蛇的方向
	}
	return 0;
}