小游戏贪吃蛇的c++源代码，快来看看，还带解释
#include
#include
#include
#include
#include <conio.h>
#include
#include <windows.h>
using namespace std;

/*** 光标定位 ***/
HANDLE hout=GetStdHandle(STD_OUTPUT_HANDLE);
COORD coord;

void locate(int x,int y)
{
coord.X=y;
coord.Y=x;
SetConsoleCursorPosition(hout,coord);
};

/*** 隐藏光标 ***/
void hide()
{
CONSOLE_CURSOR_INFO cursor_info={1,0};
SetConsoleCursorInfo(hout, &cursor_info);
}

/*** 生成随机数 ***/
double random(double start, double end)
{
return start+(end-start)*rand()/(RAND_MAX + 1.0);
}

/*** 定义地图的长宽，蛇的坐标，长度，方向，食物的位置 ***/
int m,n;

struct node
{
int x,y;
}snake[1000];

int snake_length,dir;
node food;
int direct[4][2]={{-1,0},{1,0},{0,-1},{0,1}};

/*** 输出墙 ***/
void print_wall()
{
cout << " ";
for (int i=1;i<=n;i++)
cout << “-”;
cout << endl;
for (int j=0;j<=m-1;j++)
{
cout << “|”;
for (int i=1;i<=n;i++) cout << " ";
cout << “|” << endl;
}
cout << " ";
for (int i=1;i<=n;i++)
cout << “-”;
}

/*** 首次输出蛇，其中snake[0]代表头 **/
void print_snake()
{
locate(snake[0].x,snake[0].y);
cout << “@”;
for (int i=1;i<=snake_length-1;i++)
{
locate(snake[i].x,snake[i].y);
cout << "";
}
}

/*** 判断是否撞墙或者自撞 ***/
bool is_correct()
{
if (snake[0].x0 || snake[0].y0 || snake[0].xm+1 || snake[0].yn+1) return false;
for (int i=1;i<=snake_length-1;i++)
{
if (snake[0].xsnake[i].x && snake[0].ysnake[i].y) return false;
}
return true;
}

/*** 随机生成并输出食物位置 ***/
bool print_food()
{
srand((unsigned)time(0));
bool e;
while (1)
{
e=true;
int i=(int) random(0,m)+1,j=(int) random(0,n)+1;
food.x=i;food.y=j;
for (int k=0;k<=snake_length-1;k++)
{
if (snake[k].xfood.x && snake[k].yfood.y)
{
e=false;break;
}
}
if (e) break;
}
locate(food.x,food.y);
cout << “$”;
return true;
}

/*** 蛇的前进 /
bool go_ahead()
{
node temp;
bool e=false;
temp=snake[snake_length-1];
for (int i=snake_length-1;i>=1;i–)
snake[i]=snake[i-1];
snake[0].x+=direct[dir][0];
snake[0].y+=direct[dir][1];
locate(snake[1].x,snake[1].y);
cout << "";
/* 吃到了食物 /
if (snake[0].xfood.x && snake[0].yfood.y)
{
snake_length++;
e=true;
snake[snake_length-1]=temp;
}
/ 输出此时蛇状态 /
if (!e)
{
locate(temp.x,temp.y);
cout << " ";
}
else
print_food();
locate(snake[0].x,snake[0].y);
cout << “@”;
/ 如果自撞 ***/
if (!is_correct())
{
system(“cls”);
cout << “You lose!” << endl << "Length: " << snake_length << endl;
return false;
}
return true;
}

/*** 主函数 /
int main()
{
cout << “--------------------贪吃蛇---------------------” << endl;
cout << “请先输入两个数,表示地图大小.要求长宽均不小于10.” << endl;
cout << “请注意窗口大小,以免发生错位.建议将窗口调为最大.” << endl;
cout << “再选择难度.请在1-10中输入1个数,1最简单,10则最难” << endl;
cout << “然后进入游戏画面,以方向键控制方向.祝你游戏愉快!” << endl;
cout << “-----------------------------------------------” << endl;
cin >> m >> n;
if (m<10 || n<10 || m>25 || n>40)
{
cout << “ERROR” << endl;
system(“pause”);
return 0;
}
int hard;
cin >> hard;
if (hard<=0 || hard>100)
{
cout << “ERROR” << endl;
system(“pause”);
return 0;
}
/ 数据全部初始化，包括蛇长，位置，方向 /
snake_length=5;
clock_t a,b;
char ch;
double hard_len;
for (int i=0;i<=4;i++)
{
snake[i].x=1;
snake[i].y=5-i;
}
dir=3;
/ 输出初始地图，蛇与食物 /
system(“cls”);
hide();
print_wall();
print_food();
print_snake();
locate(m+2,0);
cout << "Now length: ";
/ 开始游戏 /
while (1)
{
/ 难度随长度增加而提高 /
hard_len=(double)snake_length/(double) (mn);
/* 调节时间，单位是ms /
a=clock();
while (1)
{
b=clock();
if (b-a>=(int)(400-30hard)(1-sqrt(hard_len))) break;
}
/** 接受键盘输入的上下左右，并以此改变方向 /
if (kbhit())
{
ch=getch();
if (ch==-32)
{
ch=getch();
switch(ch)
{
case 72:
if (dir2 || dir3)
dir=0;
break;
case 80:
if (dir2 || dir3)
dir=1;
break;
case 75:
if (dir0 || dir1)
dir=2;
break;
case 77:
if (dir0 || dir1)
dir=3;
break;
}
}
}
/ 前进 /
if (!go_ahead()) break;
/ 在最后输出此时长度 ***/
locate(m+2,12);
cout << snake_length;
}
system(“pause”);
return 0;
}