用c语言写个贪吃蛇代码

以下是一个基本的贪吃蛇游戏的 C 语言代码：

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

#define width 20
#define height 20

int snake[100][2];
int length = 3;
int food[2];
int score = 0;
int direction = 1;  // 1: up, 2: down, 3: left, 4: right

void init() {
    srand((unsigned)time(NULL));  // 随机数种子
    snake[0][0] = height / 2;
    snake[0][1] = width / 2;
    for (int i = 1; i < length; i++) {
        snake[i][0] = snake[0][0] + i;
        snake[i][1] = snake[0][1];
    }
    food[0] = rand() % height;
    food[1] = rand() % width;
    score = 0;
    direction = 1;
}

void draw() {
    system("cls");  // 清屏
    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][0] && j == snake[0][1]) {
                printf("O");
            } else if (i == food[0] && j == food[1]) {
                printf("$");
            } else {
                int flag = 0;
                for (int k = 1; k < length; k++) {
                    if (i == snake[k][0] && j == snake[k][1]) {
                        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 update() {
    int tail[2] = {snake[length - 1][0], snake[length - 1][1]};
    for (int i = length - 1; i > 0; i--) {
        snake[i][0] = snake[i - 1][0];
        snake[i][1] = snake[i - 1][1];
    }
    switch (direction) {
        case 1:
            snake[0][0]--;
            break;
        case 2:
            snake[0][0]++;
            break;
        case 3:
            snake[0][1]--;
            break;
        case 4:
            snake[0][1]++;
            break;
    }
    if (snake[0][0] == food[0] && snake[0][1] == food[1]) {
        length++;
        score += 10;
        food[0] = rand() % height;
        food[1] = rand() % width;
    }
    if (snake[0][0] < 0 || snake[0][0] >= height || snake[0][1] < 0 || snake[0][1] >= width) {
        init();
    }
    for (int i = 1; i < length; i++) {
        if (snake[0][0] == snake[i][0] && snake[0][1] == snake[i][1]) {
            init();
        }
    }
}

void input() {
    if (kbhit()) {  // 检测是否有按键输入
        char c = getch();  // 获取按键
        if (c == 'w' && direction != 2) {
            direction = 1;
        } else if (c == 's' && direction != 1) {
            direction = 2;
        } else if (c == 'a' && direction != 4) {
            direction = 3;
        } else if (c == 'd' && direction != 3) {
            direction = 4;
        }
    }
}

int main() {
    init();
    while (1) {
        draw();
        update();
        input();
        Sleep(100);  // 休眠 100 毫秒
    }
    return 0;
}

请注意，此代码使用了 Windows 系统下的 `conio.h` 头文件，可能不适用于其他操作系统。