C语言编写一个贪吃蛇游戏

非常感谢您的提问！以下是一个简单的 C 语言贪吃蛇游戏的代码示例：

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

#define WIDTH 20
#define HEIGHT 20

int snake[WIDTH * HEIGHT][2];
int food[2];
int length = 3;
int direction = 0; // 0: up, 1: right, 2: down, 3: left

void init() {
    srand((unsigned)time(NULL));
    snake[0][0] = WIDTH / 2;
    snake[0][1] = HEIGHT / 2;
    snake[1][0] = snake[0][0];
    snake[1][1] = snake[0][1] + 1;
    snake[2][0] = snake[0][0];
    snake[2][1] = snake[0][1] + 2;
    food[0] = rand() % WIDTH;
    food[1] = rand() % HEIGHT;
}

void draw() {
    system("cls");
    for (int i = 0; i < HEIGHT; i++) {
        for (int j = 0; j < WIDTH; j++) {
            if (i == food[1] && j == food[0]) {
                printf("F");
            } else {
                int flag = 0;
                for (int k = 0; k < length; k++) {
                    if (snake[k][0] == j && snake[k][1] == i) {
                        printf("O");
                        flag = 1;
                        break;
                    }
                }
                if (!flag) {
                    printf(" ");
                }
            }
        }
        printf("\n");
    }
}

void update() {
    int dx = 0, dy = 0;
    switch (direction) {
        case 0: dy = -1; break;
        case 1: dx = 1; break;
        case 2: dy = 1; break;
        case 3: dx = -1; break;
    }
    int nx = snake[length - 1][0] + dx;
    int ny = snake[length - 1][1] + dy;
    if (nx < 0 || nx >= WIDTH || ny < 0 || ny >= HEIGHT) {
        printf("Game over!\n");
        exit(0);
    }
    for (int i = 0; i < length - 1; i++) {
        if (snake[i][0] == nx && snake[i][1] == ny) {
            printf("Game over!\n");
            exit(0);
        }
    }
    if (nx == food[0] && ny == food[1]) {
        length++;
        food[0] = rand() % WIDTH;
        food[1] = rand() % HEIGHT;
    }
    for (int i = 0; i < length - 1; i++) {
        snake[i][0] = snake[i + 1][0];
        snake[i][1] = snake[i + 1][1];
    }
    snake[length - 1][0] = nx;
    snake[length - 1][1] = ny;
}

void input() {
    if (_kbhit()) {
        int key = _getch();
        switch (key) {
            case 'w': direction = 0; break;
            case 'd': direction = 1; break;
            case 's': direction = 2; break;
            case 'a': direction = 3; break;
        }
    }
}

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

希望这个代码示例能够帮助您！