用C++实现经典的贪吃蛇游戏；要求：积分计算、游戏开始后允许“新游戏、暂停、继续”、蛇运行速度可调节

好的，我会尽力回答你的问题。首先，实现经典的贪吃蛇游戏需要考虑以下几个方面：

1. 游戏界面的设计与绘制
2. 蛇的运动与碰撞检测
3. 食物的生成与碰撞检测
4. 游戏积分的计算与显示
5. 游戏控制的响应与处理

下面是一个简单的实现，仅供参考：

#include <iostream>
#include <conio.h>
#include <windows.h>
#include <ctime>

using namespace std;

const int WIDTH = 40;           // 游戏界面宽度
const int HEIGHT = 20;          // 游戏界面高度
const int SPEED[5] = { 200, 150, 100, 75, 50 }; // 蛇的运动速度
const int MAX_SCORE = 99999;    // 最高分数
const int MAX_LENGTH = 100;     // 蛇的最大长度

enum Direction { UP, DOWN, LEFT, RIGHT }; // 蛇的运动方向

struct Point // 点的结构体
{
    int x, y;
};

struct Snake // 蛇的结构体
{
    int length;
    int score;
    int speed;
    Point head;
    Point body[MAX_LENGTH];
    Direction direction;
};

struct Food // 食物的结构体
{
    Point position;
};

void gotoxy(int x, int y) // 光标跳转
{
    COORD pos;
    pos.X = x;
    pos.Y = y;
    SetConsoleCursorPosition(GetStdHandle(STD_OUTPUT_HANDLE), pos);
}

void initGame(Snake& snake, Food& food) // 初始化游戏
{
    srand((unsigned)time(NULL)); // 随机数种子
    snake.length = 3;            // 初始长度为3
    snake.score = 0;             // 初始得分为0
    snake.speed = SPEED[0];      // 初始速度为最慢
    snake.direction = RIGHT;     // 初始方向为向右
    snake.head.x = WIDTH / 2;
    snake.head.y = HEIGHT / 2;
    for (int i = 0; i < snake.length; i++) // 初始蛇的位置
    {
        snake.body[i].x = snake.head.x - i;
        snake.body[i].y = snake.head.y;
    }
    food.position.x = rand() % (WIDTH - 2) + 1; // 随机生成食物位置
    food.position.y = rand() % (HEIGHT - 2) + 1;
}

void drawMap() // 绘制游戏界面
{
    for (int i = 0; i < HEIGHT; i++)
    {
        for (int j = 0; j < WIDTH; j++)
        {
            if (i == 0 || i == HEIGHT - 1 || j == 0 || j == WIDTH - 1)
                cout << "#"; // 边框
            else
                cout << " ";
        }
        cout << endl;
    }
}

void drawSnake(Snake snake) // 绘制蛇
{
    gotoxy(snake.head.x, snake.head.y);
    cout << "@";
    for (int i = 0; i < snake.length; i++)
    {
        gotoxy(snake.body[i].x, snake.body[i].y);
        cout << "*";
    }
}

void drawFood(Food food) // 绘制食物
{
    gotoxy(food.position.x, food.position.y);
    cout << "$";
}

void updateScore(Snake snake) // 更新分数
{
    gotoxy(WIDTH + 2, 2);
    cout << "Score: " << snake.score;
}

void updateSpeed(Snake snake) // 更新速度
{
    gotoxy(WIDTH + 2, 4);
    cout << "Speed: " << snake.speed;
}

void updateLength(Snake& snake) // 更新长度
{
    if (snake.length < MAX_LENGTH)
        snake.length++;
}

void updateDirection(Snake& snake, char input) // 更新方向
{
    switch (input)
    {
    case 'w':
    case 'W':
        if (snake.direction != DOWN)
            snake.direction = UP;
        break;
    case 's':
    case 'S':
        if (snake.direction != UP)
            snake.direction = DOWN;
        break;
    case 'a':
    case 'A':
        if (snake.direction != RIGHT)
            snake.direction = LEFT;
        break;
    case 'd':
    case 'D':
        if (snake.direction != LEFT)
            snake.direction = RIGHT;
        break;
    default:
        break;
    }
}

void updateHead(Snake& snake) // 更新蛇头位置
{
    switch (snake.direction)
    {
    case UP:
        snake.head.y--;
        break;
    case DOWN:
        snake.head.y++;
        break;
    case LEFT:
        snake.head.x--;
        break;
    case RIGHT:
        snake.head.x++;
        break;
    default:
        break;
    }
}

void updateBody(Snake& snake) // 更新蛇身位置
{
    for (int i = snake.length - 1; i > 0; i--)
    {
        snake.body[i].x = snake.body[i - 1].x;
        snake.body[i].y = snake.body[i - 1].y;
    }
    snake.body[0].x = snake.head.x;
    snake.body[0].y = snake.head.y;
}

bool isHitWall(Snake snake) // 判断是否撞墙
{
    if (snake.head.x == 0 || snake.head.x == WIDTH - 1 ||
        snake.head.y == 0 || snake.head.y == HEIGHT - 1)
        return true;
    return false;
}

bool isHitBody(Snake snake) // 判断是否撞身体
{
    for (int i = 0; i < snake.length; i++)
    {
        if (snake.head.x == snake.body[i].x && snake.head.y == snake.body[i].y)
            return true;
    }
    return false;
}

bool isEatFood(Snake& snake, Food food) // 判断是否吃到食物
{
    if (snake.head.x == food.position.x && snake.head.y == food.position.y)
    {
        updateLength(snake);
        snake.score += 10;
        if (snake.score > MAX_SCORE)
            snake.score = MAX_SCORE;
        for (int i = 0; i < snake.length; i++)
        {
            if (food.position.x == snake.body[i].x && food.position.y == snake.body[i].y)
            {
                food.position.x = rand() % (WIDTH - 2) + 1;
                food.position.y = rand() % (HEIGHT - 2) + 1;
                i = -1;
            }
        }
        return true;
    }
    return false;
}

void gameLoop() // 游戏循环
{
    Snake snake;
    Food food;
    initGame(snake, food);
    drawMap();
    drawSnake(snake);
    drawFood(food);
    updateScore(snake);
    updateSpeed(snake);
    while (true)
    {
        if (_kbhit()) // 检测键盘输入
        {
            char input = _getch();
            if (input == 27) // 按下ESC键退出游戏
                break;
            else if (input == ' ') // 按下空格键暂停/继续游戏
            {
                while (true)
                {
                    if (_kbhit())
                    {
                        input = _getch();
                        if (input == ' ')
                            break;
                    }
                    Sleep(100);
                }
            }
            else if (input == '1' || input == '2' || input == '3' || input == '4' || input == '5') // 调节速度
            {
                int level = input - '0' - 1;
                snake.speed = SPEED[level];
                updateSpeed(snake);
            }
            else
                updateDirection(snake, input);
        }
        updateHead(snake);
        updateBody(snake);
        if (isHitWall(snake) || isHitBody(snake)) // 判断游戏结束
        {
            gotoxy(WIDTH / 2 - 4, HEIGHT / 2);
            cout << "Game Over!";
            break;
        }
        if (isEatFood(snake, food)) // 判断是否吃到食物
        {
            drawFood(food);
            updateScore(snake);
        }
        drawSnake(snake);
        Sleep(snake.speed);
    }
}

int main()
{
    gameLoop();
    return 0;
}

这是一个基本的实现，还有很多可以改进的地方，比如增加游戏音效、添加障碍物、优化蛇的移动方式等等。希望能对你有所帮助。