帮我写份贪吃蛇C加加代码

贪吃蛇是一个经典的电子游戏，通常用C++编写。这里给出一个简单的控制台版贪吃蛇的基本框架，使用了C++11的特性。请注意，完整的游戏还包括窗口绘制、键盘输入处理等部分，这里仅提供核心的部分代码：

#include <iostream>
#include <conio.h> // for getch() function in Windows
using namespace std;

struct Snake {
    int x[4], y[4]; // array to store snake segments
};

Snake snake; // initialize the snake with one segment at origin
int foodX = rand() % 20 + 1, foodY = rand() % 20 + 1;
bool gameRunning = true;

void moveSnake(int dx, int dy) {
    for (int i = 3; i > 0; i--) {
        snake.x[i] = snake.x[i - 1];
        snake.y[i] = snake.y[i - 1];
    }
    snake.x[0] += dx;
    snake.y[0] += dy;
}

// Draw the snake on console
void drawSnake() {
    for (int i = 0; i < 4; i++) {
        cout << "o ";
    }
    cout << endl;
}

int main() {
    while (gameRunning) {
        // Check if snake ate food
        if (snake.x[0] == foodX && snake.y[0] == foodY) {
            foodX = rand() % 20 + 1;
            foodY = rand() % 20 + 1;
            snake.x[3] = snake.x[0];
            snake.y[3] = snake.y[0];
        } else {
            snake.x[0] = snake.x[3]; // remove tail of the snake
            snake.y[0] = snake.y[3];
        }

        // Move the snake based on user input or a random direction
        char dir = _getch(); // Get user input from keyboard
        switch (dir) {
            case 'a': moveSnake(-1, 0); break;
            case 'd': moveSnake(1, 0); break;
            case 'w': moveSnake(0, -1); break;
            case 's': moveSnake(0, 1); break;
            default: continue; // ignore other keys
        }

        // Check boundaries and collision with self
        if (snake.x[0] < 1 || snake.x[0] > 20 || snake.y[0] < 1 || snake.y[0] > 20) {
            gameRunning = false;
        } else {
            for (int i = 1; i < 4; i++) {
                if (snake.x[0] == snake.x[i] && snake.y[0] == snake.y[i]) {
                    gameRunning = false;
                }
            }
        }

        drawSnake();
    }
    return 0;
}