写一个贪吃蛇的程序c语言

以下是一个简单的贪吃蛇游戏程序，使用了C语言和Windows API：

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

// 定义常量
#define WIDTH 50
#define HEIGHT 20
#define SNAKE_MAX_LENGTH (WIDTH * HEIGHT)

// 定义结构体
typedef struct {
    int x;
    int y;
} Position;

// 定义全局变量
Position snake[SNAKE_MAX_LENGTH];
int snakeLength = 3;
Position food;
int score = 0;

// 打印地图
void drawMap() {
    system("cls"); // 清屏
    for (int y = 0; y < HEIGHT; y++) {
        for (int x = 0; x < WIDTH; x++) {
            if (x == 0 || x == WIDTH - 1 || y == 0 || y == HEIGHT - 1) {
                printf("#"); // 边界
            } else if (x == food.x && y == food.y) {
                printf("$"); // 食物
            } else {
                int isSnakeBody = 0;
                for (int i = 0; i < snakeLength; i++) {
                    if (snake[i].x == x && snake[i].y == y) {
                        printf("*"); // 蛇身
                        isSnakeBody = 1;
                        break;
                    }
                }
                if (!isSnakeBody) {
                    printf(" "); // 空格
                }
            }
        }
        printf("\n");
    }
    printf("Score: %d\n", score); // 分数
}

// 生成食物
void generateFood() {
    int x, y;
    do {
        x = rand() % (WIDTH - 2) + 1;
        y = rand() % (HEIGHT - 2) + 1;
    } while (x == food.x && y == food.y);
    food.x = x;
    food.y = y;
}

// 向左移动
void moveLeft() {
    for (int i = snakeLength - 1; i > 0; i--) {
        snake[i].x = snake[i - 1].x;
        snake[i].y = snake[i - 1].y;
    }
    snake[0].x--;
}

// 向右移动
void moveRight() {
    for (int i = snakeLength - 1; i > 0; i--) {
        snake[i].x = snake[i - 1].x;
        snake[i].y = snake[i - 1].y;
    }
    snake[0].x++;
}

// 向上移动
void moveUp() {
    for (int i = snakeLength - 1; i > 0; i--) {
        snake[i].x = snake[i - 1].x;
        snake[i].y = snake[i - 1].y;
    }
    snake[0].y--;
}

// 向下移动
void moveDown() {
    for (int i = snakeLength - 1; i > 0; i--) {
        snake[i].x = snake[i - 1].x;
        snake[i].y = snake[i - 1].y;
    }
    snake[0].y++;
}

// 判断游戏是否结束
int isGameOver() {
    if (snake[0].x == 0 || snake[0].x == WIDTH - 1
            || snake[0].y == 0 || snake[0].y == HEIGHT - 1) {
        return 1; // 撞墙了
    }
    for (int i = 1; i < snakeLength; i++) {
        if (snake[i].x == snake[0].x && snake[i].y == snake[0].y) {
            return 1; // 撞到自己了
        }
    }
    return 0;
}

int main() {
    srand((unsigned int)time(NULL)); // 初始化随机数种子
    snake[0].x = WIDTH / 2;
    snake[0].y = HEIGHT / 2;
    snake[1].x = snake[0].x - 1;
    snake[1].y = snake[0].y;
    snake[2].x = snake[1].x - 1;
    snake[2].y = snake[1].y;
    generateFood();
    drawMap();
    while (!isGameOver()) {
        // 处理输入
        if (GetAsyncKeyState(VK_LEFT) & 0x8000) {
            moveLeft();
        } else if (GetAsyncKeyState(VK_RIGHT) & 0x8000) {
            moveRight();
        } else if (GetAsyncKeyState(VK_UP) & 0x8000) {
            moveUp();
        } else if (GetAsyncKeyState(VK_DOWN) & 0x8000) {
            moveDown();
        }
        // 判断是否吃到食物
        if (snake[0].x == food.x && snake[0].y == food.y) {
            snakeLength++;
            score++;
            generateFood();
        }
        // 绘制地图
        drawMap();
        // 等待一会儿
        Sleep(100);
    }
    printf("Game Over!\n");
    printf("Your Score: %d\n", score);
    return 0;
}

这个程序使用了Windows API中的GetAsyncKeyState和Sleep函数，需要在Windows操作系统下运行。如果要在其他操作系统下运行，需要使用其他的输入和延时函数。