用C++写一个贪吃蛇小游戏

非常感谢您的提问！以下是一个简单的贪吃蛇小游戏的C代码：

#include <stdio.h>
#include <stdlib.h>
#include <conio.h>
#include <windows.h>

#define WIDTH 30
#define HEIGHT 20

int score = 0;
int gameover = 0;
int speed = 100;

COORD snake[100];
int len = 3;
int dir = 3; // 1-up, 2-down, 3-left, 4-right

void gotoxy(int x, int y) {
    COORD pos = {x, y};
    SetConsoleCursorPosition(GetStdHandle(STD_OUTPUT_HANDLE), pos);
}

void draw() {
    system("cls");
    for (int i = 0; i < WIDTH + 2; i++) {
        printf("#");
    }
    printf("\n");
    for (int i = 0; i < HEIGHT; i++) {
        printf("#");
        for (int j = 0; j < WIDTH; j++) {
            if (i == snake[0].Y && j == snake[0].X) {
                printf("O");
            } else if (i == snake[len - 1].Y && j == snake[len - 1].X) {
                printf("X");
            } else {
                int flag = 0;
                for (int k = 1; k < len - 1; k++) {
                    if (i == snake[k].Y && j == snake[k].X) {
                        printf("o");
                        flag = 1;
                        break;
                    }
                }
                if (!flag) {
                    printf(" ");
                }
            }
        }
        printf("#\n");
    }
    for (int i = 0; i < WIDTH + 2; i++) {
        printf("#");
    }
    printf("\n");
    printf("Score: %d\n", score);
}

void init() {
    snake[0].X = WIDTH / 2;
    snake[0].Y = HEIGHT / 2;
    for (int i = 1; i < len; i++) {
        snake[i].X = snake[i - 1].X + 1;
        snake[i].Y = snake[i - 1].Y;
    }
}

void update() {
    for (int i = len - 1; i > 0; i--) {
        snake[i].X = snake[i - 1].X;
        snake[i].Y = snake[i - 1].Y;
    }
    switch (dir) {
        case 1:
            snake[0].Y--;
            break;
        case 2:
            snake[0].Y++;
            break;
        case 3:
            snake[0].X--;
            break;
        case 4:
            snake[0].X++;
            break;
    }
    if (snake[0].X < 0 || snake[0].X >= WIDTH || snake[0].Y < 0 || snake[0].Y >= HEIGHT) {
        gameover = 1;
        return;
    }
    for (int i = 1; i < len; i++) {
        if (snake[0].X == snake[i].X && snake[0].Y == snake[i].Y) {
            gameover = 1;
            return;
        }
    }
    if (snake[0].X == snake[len - 1].X && snake[0].Y == snake[len - 1].Y) {
        len++;
        score += 10;
        if (speed > 10) {
            speed -= 10;
        }
    }
}

void input() {
    if (_kbhit()) {
        switch (_getch()) {
            case 'w':
                if (dir != 2) {
                    dir = 1;
                }
                break;
            case 's':
                if (dir != 1) {
                    dir = 2;
                }
                break;
            case 'a':
                if (dir != 4) {
                    dir = 3;
                }
                break;
            case 'd':
                if (dir != 3) {
                    dir = 4;
                }
                break;
        }
    }
}

int main() {
    init();
    while (!gameover) {
        draw();
        update();
        input();
        Sleep(speed);
    }
    gotoxy(WIDTH / 2 - 4, HEIGHT / 2);
    printf("Game Over!\n");
    gotoxy(WIDTH / 2 - 6, HEIGHT / 2 + 1);
    printf("Your score: %d\n", score);
    return 0;
}

希望这个代码能够帮助您实现一个简单的贪吃蛇小游戏！