C++ VS2013 贪吃蛇小游戏

#define _CRT_SECURE_NO_WARNINGS
#include<iostream>
#include<windows.h>
#include<time.h>
#include<stdlib.h>
#include<conio.h>
#define N 21
void gotoxy(int x, int y)//位置函数
{
COORD pos;
pos.X = 2 * x;
pos.Y = y;
SetConsoleCursorPosition(GetStdHandle(STD_OUTPUT_HANDLE), pos);
}
void color(int a)//颜色函数
{
SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), a);
}
void init(int apple[2])//初始化函数（初始化围墙、显示信息、苹果）
{
int i, j;//初始化围墙
int wall[N + 2][N + 2] = { { 0 } };
for (i = 1; i <= N; i++)
{
for (j = 1; j <= N; j++)
wall[i][j] = 1;
}
color(11);
for (i = 0; i<N + 2; i++)
{
for (j = 0; j<N + 2; j++)
{
if (wall[i][j])
std::cout << "■";
else std::cout << "□";
}
std::cout << std::endl;
}
gotoxy(N + 3, 1);//显示信息
color(20);
std::cout << "按 W S A D 移动方向" << std::endl;
gotoxy(N + 3, 2);
color(20);
std::cout << "按任意键暂停" << std::endl;
gotoxy(N + 3, 3);
color(20);
std::cout << "得分：" << std::endl;
apple[0] = rand() % N + 1;//苹果
apple[1] = rand() % N + 1;
gotoxy(apple[0], apple[1]);
color(12);
std::cout << "●" << std::endl;
}
int main()
{
int i, j;
int** snake = NULL;
int apple[2];
int score = 0;
int tail[2];
int len = 3;
char ch = 'p';
srand((unsigned)time(NULL));
init(apple);
snake = (int**)realloc(snake, sizeof(int*)*len);
for (i = 0; i<len; i++)
snake[i] = (int*)malloc(sizeof(int)* 2);
for (i = 0; i<len; i++)
{
snake[i][0] = N / 2;
snake[i][1] = N / 2 + i;
gotoxy(snake[i][0], snake[i][1]);
color(14);
std::cout << "★" << std::endl;
}
while (1)//进入消息循环
{
tail[0] = snake[len - 1][0];
tail[1] = snake[len - 1][1];
gotoxy(tail[0], tail[1]);
color(11);
std::cout << "■" << std::endl;
for (i = len - 1; i>0; i--)
{
snake[i][0] = snake[i - 1][0];
snake[i][1] = snake[i - 1][1];
gotoxy(snake[i][0], snake[i][1]);
color(14);
std::cout << "★" << std::endl;
}
if (_kbhit())
{
gotoxy(0, N + 2);
ch = _getche();
}
switch (ch)
{
case 'w':snake[0][1]--; break;
case 's':snake[0][1]++; break;
case 'a':snake[0][0]--; break;
case 'd':snake[0][0]++; break;
default: break;
}
gotoxy(snake[0][0], snake[0][1]);
color(14);
std::cout << "★" << std::endl;
Sleep(abs(200 - 0.5*score));
if (snake[0][0] == apple[0] && snake[0][1] == apple[1])//吃掉苹果后蛇分数加1，蛇长加1
{
score++;
len++;
snake = (int**)realloc(snake, sizeof(int*)*len);
snake[len - 1] = (int*)malloc(sizeof(int)* 2);
apple[0] = rand() % N + 1;
apple[1] = rand() % N + 1;
gotoxy(apple[0], apple[1]);
color(12);
std::cout << "●" << std::endl;
gotoxy(N + 5, 3);
color(20);
std::cout << score << std::endl;
}
if (snake[0][1] == 0 || snake[0][1] == N || snake[0][0] == 0 || snake[0][0] == N)//撞到围墙后失败
{
gotoxy(N / 2, N / 2);
color(30);
std::cout << "失败！！！" << std::endl;
for (i = 0; i<len; i++)
free(snake[i]);
Sleep(INFINITE);
exit(0);
}
}
return 0;
}