写一下贪吃蛇的C语言程序

贪吃蛇是一款经典的电子游戏，玩家控制一条不断增长的蛇，通过吃掉屏幕上出现的食物来获得分数，同时避免蛇头撞到自己的身体或游戏边界。

以下是一个简化的贪吃蛇游戏的C语言程序的基本框架，由于编写完整的贪吃蛇程序相对复杂，这里只提供核心思路和部分代码片段，不包括完整的功能实现。

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

#define WIDTH 20
#define HEIGHT 20

int x, y, fruitX, fruitY, score;
int tailX[100], tailY[100];
int nTail;
enum eDirection { STOP = 0, LEFT, RIGHT, UP, DOWN};
enum eDirection dir;

void Setup() {
    dir = STOP;
    x = WIDTH / 2;
    y = HEIGHT / 2;
    fruitX = rand() % WIDTH;
    fruitY = rand() % HEIGHT;
    score = 0;
}

void Draw() {
    system("cls");
    for (int i = 0; i < WIDTH + 2; i++)
        printf("#");
    printf("\n");

    for (int i = 0; i < HEIGHT; i++) {
        for (int j = 0; j < WIDTH; j++) {
            if (j == 0)
                printf("#");
            if (i == y && j == x)
                printf("O");
            else if (i == fruitY && j == fruitX)
                printf("F");
            else {
                int print = 0;
                for (int k = 0; k < nTail; k++) {
                    if (tailX[k] == j && tailY[k] == i) {
                        printf("o");
                        print = 1;
                    }
                }
                if (!print)
                    printf(" ");
            }

            if (j == WIDTH - 1)
                printf("#");
        }
        printf("\n");
    }

    for (int i = 0; i < WIDTH + 2; i++)
        printf("#");
    printf("\n");
    printf("Score: %d\n", score);
}

void Input() {
    if (_kbhit()) {
        switch (_getch()) {
            case 'a':
                dir = LEFT;
                break;
            case 'd':
                dir = RIGHT;
                break;
            case 'w':
                dir = UP;
                break;
            case 's':
                dir = DOWN;
                break;
            case 'x':
                dir = STOP;
                break;
        }
    }
}

void Logic() {
    // Move the tail
    int prevX = tailX[0];
    int prevY = tailY[0];
    int prev2X, prev2Y;
    tailX[0] = x;
    tailY[0] = y;
    for (int i = 1; i < nTail; i++) {
        prev2X = tailX[i];
        prev2Y = tailY[i];
        tailX[i] = prevX;
        tailY[i] = prevY;
        prevX = prev2X;
        prevY = prev2Y;
    }
    // Move the snake's head
    switch (dir) {
        case LEFT:
            x--;
            break;
        case RIGHT:
            x++;
            break;
        case UP:
            y--;
            break;
        case DOWN:
            y++;
            break;
        default:
            break;
    }

    // Check collision with the walls
    if (x >= WIDTH || x < 0 || y >= HEIGHT || y < 0)
        dir = STOP; // Game over

    // Check collision with the tail
    for (int i = 0; i < nTail; i++)
        if (tailX[i] == x && tailY[i] == y)
            dir = STOP; // Game over

    // Check if snake has eaten the fruit
    if (x == fruitX && y == fruitY) {
        score += 10;
        fruitX = rand() % WIDTH;
        fruitY = rand() % HEIGHT;
        nTail++;
    }
}

int main() {
    Setup();
    while (dir != STOP) {
        Draw();
        Input();
        Logic();
        Sleep(100); // Sleep for 100 milliseconds
    }
    return 0;
}

这个程序实现了贪吃蛇游戏的基本框架，包括游戏初始化、绘制游戏界面、处理输入和游戏逻辑。注意，这个程序需要在支持conio.h和windows.h的环境中编译和运行，例如Windows的命令提示符或者使用支持这些库的编译器。