给我写贪吃蛇C语言代码

好的，这是一份简单的贪吃蛇的C语言代码：

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

#define UP 72
#define LEFT 75
#define RIGHT 77
#define DOWN 80

#define WIDTH 20
#define HEIGHT 20

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

void hidecursor() {
  CONSOLE_CURSOR_INFO cursor_info = {1, 0};
  SetConsoleCursorInfo(GetStdHandle(STD_OUTPUT_HANDLE), &cursor_info);
}

void draw(int x, int y, char use) {
  gotoxy(x, y); printf("%c", use);
}

int main() {
  int x, y, fruitx, fruity, gameover, score, flag;
  int tailx[100], taily[100];
  int ntail;
  char key;
  hidecursor();
  gameover = 0;
  x = WIDTH / 2;
  y = HEIGHT / 2;
  fruitx = rand() % WIDTH;
  fruity = rand() % HEIGHT;
  score = 0;

  while (!gameover) {
    // 在图形界面边界画边框
    for (int i = 0; i < WIDTH + 2; i++) {
      draw(i, 0, '#');
      draw(i, HEIGHT + 1, '#');
    }
    for (int i = 0; i < HEIGHT + 2; i++) {
      draw(0, i, '#');
      draw(WIDTH + 1, i, '#');
    }

    // 画出蛇头和蛇尾
    draw(x, y, 'O');
    for (int i = 0; i < ntail; i++) {
      draw(tailx[i], taily[i], 'o');
    }

    // 画出水果
    draw(fruitx, fruity, 'F');

    // 移动蛇尾
    for (int i = ntail - 1; i > 0; i--) {
      tailx[i] = tailx[i - 1];
      taily[i] = taily[i - 1];
    }
    tailx[0] = x;
    taily[0] = y;

    // 获取方向键
    key = getch();

    // 移动蛇头
    if (key == RIGHT) x++;
    else if (key == LEFT) x--;
    else if (key == UP) y--;
    else if (key == DOWN) y++;

    // 游戏结