用 c语言编写一个贪吃蛇游戏

好的，下面是用C语言编写的简单贪吃蛇游戏的代码。注释已经加得很详细了，希望能帮到你。

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

#define WIDTH 50    // 地图宽度
#define HEIGHT 20   // 地图高度
#define SNAKE_MAX_LENGTH 100    // 蛇的最大长度

// 蛇的结构体
struct Snake {
    int x[SNAKE_MAX_LENGTH];    // 蛇身的x坐标
    int y[SNAKE_MAX_LENGTH];    // 蛇身的y坐标
    int length; // 蛇的长度
    int direction;  // 蛇的移动方向
    int is_eating;  // 蛇是否正在吃食物
};

// 食物的结构体
struct Food {
    int x;  // 食物的x坐标
    int y;  // 食物的y坐标
    int is_eaten;   // 食物是否被吃掉了
};

// 游戏状态的枚举类型
enum GameState {
    GAME_RUNNING,   // 游戏正在运行
    GAME_OVER       // 游戏结束
};

// 绘制地图
void draw_map(struct Snake snake, struct Food food) {
    int i, j;
    system("cls");  // 清屏

    // 绘制上边界
    for (i = 0; i < WIDTH + 2; i++) {
        printf("-");
    }
    printf("\n");

    // 绘制内部地图
    for (i = 0; i < HEIGHT; i++) {
        printf("|");    // 绘制左边界
        for (j = 0; j < WIDTH; j++) {
            if (i == snake.y[0] && j == snake.x[0]) {  // 绘制蛇头
                printf("O");
            } else if (i == food.y && j == food.x) {   // 绘制食物
                printf("*");
            } else {
                int k;
                int is_body = 0;
                for (k = 1; k < snake.length; k++) {
                    if (i == snake.y[k] && j == snake.x[k]) {
                        printf("+");    // 绘制蛇身
                        is_body = 1;
                        break;
                    }
                }
                if (!is_body) {
                    printf(" ");    // 绘制空格
                }
            }
        }
        printf("|");    // 绘制右边界
        printf("\n");
    }

    // 绘制下边界
    for (i = 0; i < WIDTH + 2; i++) {
        printf("-");
    }
    printf("\n");
}

// 初始化蛇
void init_snake(struct Snake *snake) {
    snake->x[0] = 10;
    snake->y[0] = 10;
    snake->length = 3;
    snake->direction = 'a';
    snake->is_eating = 0;
}

// 初始化食物
void init_food(struct Food *food) {
    food->x = rand() % WIDTH;
    food->y = rand() % HEIGHT;
    food->is_eaten = 0;
}

// 更新蛇的位置
void update_snake(struct Snake *snake) {
    int i;
    int prev_x = snake->x[0];
    int prev_y = snake->y[0];
    int next_x, next_y;

    // 根据方向更新蛇头的位置
    switch (snake->direction) {
        case 'a':
            snake->x[0]--;
            break;
        case 'd':
            snake->x[0]++;
            break;
        case 'w':
            snake->y[0]--;
            break;
        case 's':
            snake->y[0]++;
            break;
    }

    // 更新蛇身的位置
    for (i = 1; i < snake->length; i++) {
        next_x = snake->x[i];
        next_y = snake->y[i];
        snake->x[i] = prev_x;
        snake->y[i] = prev_y;
        prev_x = next_x;
        prev_y = next_y;
    }
}

// 检查是否吃到食物
void check_eating(struct Snake *snake, struct Food *food) {
    if (snake->x[0] == food->x && snake->y[0] == food->y) {
        snake->is_eating = 1;
        food->is_eaten = 1;
    } else {
        snake->is_eating = 0;
    }
}

// 更新食物的位置
void update_food(struct Food *food) {
    if (food->is_eaten) {
        food->x = rand() % WIDTH;
        food->y = rand() % HEIGHT;
        food->is_eaten = 0;
    }
}

// 检查游戏状态
int check_game_state(struct Snake snake) {
    // 撞墙
    if (snake.x[0] < 0 || snake.x[0] >= WIDTH || snake.y[0] < 0 || snake.y[0] >= HEIGHT) {
        return GAME_OVER;
    }

    // 撞自己
    int i;
    for (i = 1; i < snake.length; i++) {
        if (snake.x[0] == snake.x[i] && snake.y[0] == snake.y[i]) {
            return GAME_OVER;
        }
    }

    return GAME_RUNNING;
}

int main() {
    struct Snake snake;
    struct Food food;
    enum GameState game_state = GAME_RUNNING;

    srand(time(NULL));  // 初始化随机数

    init_snake(&snake);
    init_food(&food);

    while (game_state == GAME_RUNNING) {
        if (kbhit()) {  // 检测是否有按键按下
            int key = getch();
            if (key == 'a' || key == 'd' || key == 'w' || key == 's') {
                snake.direction = key;
            }
        }

        update_snake(&snake);
        check_eating(&snake, &food);
        update_food(&food);
        game_state = check_game_state(snake);

        draw_map(snake, food);
        Sleep(100); // 休眠100毫秒，控制游戏速度
    }

    printf("Game Over!\n");

    return 0;
}