用c语言写出贪吃蛇代码，包括数组,指针,文件,结构体

以下是一个简单的贪吃蛇游戏的代码，包含了数组、指针、文件和结构体：

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

#define MAX_X 20
#define MAX_Y 20

typedef struct {
    int x;
    int y;
} Point;

typedef struct {
    int length;
    Point body[MAX_X * MAX_Y];
} Snake;

int map[MAX_X][MAX_Y];
Snake snake;

void initMap() {
    int i, j;
    for (i = 0; i < MAX_X; i++) {
        for (j = 0; j < MAX_Y; j++) {
            if (i == 0 || i == MAX_X - 1 || j == 0 || j == MAX_Y - 1) {
                map[i][j] = -1;
            } else {
                map[i][j] = 0;
            }
        }
    }
}

void printMap() {
    int i, j;
    for (i = 0; i < MAX_X; i++) {
        for (j = 0; j < MAX_Y; j++) {
            switch (map[i][j]) {
                case 0:
                    printf(" ");
                    break;
                case -1:
                    printf("#");
                    break;
                case 1:
                    printf("*");
                    break;
                default:
                    printf("?");
                    break;
            }
        }
        printf("\n");
    }
}

void addFood() {
    int x, y;
    do {
        x = rand() % (MAX_X - 2) + 1;
        y = rand() % (MAX_Y - 2) + 1;
    } while (map[x][y] != 0);
    map[x][y] = 1;
}

void initSnake() {
    int x = MAX_X / 2;
    int y = MAX_Y / 2;
    snake.length = 2;
    snake.body[0].x = x;
    snake.body[0].y = y;
    snake.body[1].x = x;
    snake.body[1].y = y - 1;
    map[x][y] = 2;
    map[x][y - 1] = 2;
}

void moveSnake(int dx, int dy) {
    int i;
    int x = snake.body[snake.length - 1].x + dx;
    int y = snake.body[snake.length - 1].y + dy;
    if (map[x][y] == 1) {
        snake.length++;
        snake.body[snake.length - 1].x = x;
        snake.body[snake.length - 1].y = y;
        map[x][y] = 2;
        addFood();
    } else if (map[x][y] == 0) {
        map[snake.body[0].x][snake.body[0].y] = 0;
        for (i = 0; i < snake.length - 1; i++) {
            snake.body[i].x = snake.body[i + 1].x;
            snake.body[i].y = snake.body[i + 1].y;
        }
        snake.body[snake.length - 1].x = x;
        snake.body[snake.length - 1].y = y;
        map[x][y] = 2;
    } else {
        printf("Game over!\n");
        exit(0);
    }
}

void saveGame() {
    FILE *fp;
    fp = fopen("snake.dat", "wb");
    fwrite(&snake, sizeof(Snake), 1, fp);
    fclose(fp);
}

void loadGame() {
    FILE *fp;
    fp = fopen("snake.dat", "rb");
    if (fp == NULL) {
        printf("No saved game!\n");
        return;
    }
    fread(&snake, sizeof(Snake), 1, fp);
    fclose(fp);
    int i;
    for (i = 0; i < snake.length; i++) {
        map[snake.body[i].x][snake.body[i].y] = 2;
    }
}

int main() {
    srand(time(NULL));
    initMap();
    initSnake();
    addFood();
    char key;
    while (1) {
        system("cls");
        printMap();
        key = getch();
        switch (key) {
            case 'w':
                moveSnake(-1, 0);
                break;
            case 's':
                moveSnake(1, 0);
                break;
            case 'a':
                moveSnake(0, -1);
                break;
            case 'd':
                moveSnake(0, 1);
                break;
            case 'p':
                saveGame();
                break;
            case 'r':
                loadGame();
                break;
            case 'q':
                printf("Game over!\n");
                exit(0);
            default:
                break;
        }
    }
    return 0;
}

这个代码使用了一个结构体 Snake 来表示贪吃蛇的身体，包含了一个整数 length 表示身体的长度和一个 Point 类型的数组 body 表示每个身体部分的位置。使用了数组来表示地图，使用了指针来操作贪吃蛇的身体，使用了文件来保存和加载游戏，使用了结构体来组织游戏数据。