贪吃蛇程序的 C 语言实现

以下是一个简单的贪吃蛇程序的 C 语言实现：

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

#define WIDTH 20
#define HEIGHT 20

int x, y, fruitX, fruitY, score, gameover;
int tailX[100], tailY[100], nTail;

enum eDirection { STOP = 0, LEFT, RIGHT, UP, DOWN};
enum eDirection dir;

void Setup()
{
    gameover = 0;
    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':
                gameover = 1;
                break;
        }
    }
}

void Logic()
{
    int prevX = tailX[0], prevY = tailY[0], 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;
    }

    switch (dir)
    {
        case LEFT:
            x--;
            break;
        case RIGHT:
            x++;
            break;
        case UP:
            y--;
            break;
        case DOWN:
            y++;
            break;
        default:
            break;
    }

    if (x > WIDTH || x < 0 || y > HEIGHT || y < 0)
        gameover = 1;

    for (int i = 0; i < nTail; i++)
    {
        if (tailX[i] == x && tailY[i] == y)
            gameover = 1;
    }

    if (x == fruitX && y == fruitY)
    {
        score += 10;
        fruitX = rand() % WIDTH;
        fruitY = rand() % HEIGHT;
        nTail++;
    }
}

int main()
{
    Setup();

    while (!gameover)
    {
        Draw();
        Input();
        Logic();
        Sleep(50);
    }

    return 0;
}

这个程序使用了 `conio.h` 和 `windows.h` 头文件，需要在 Windows 操作系统下编译运行。程序使用了 `Setup` 函数来初始化游戏，`Draw` 函数来绘制游戏界面，`Input` 函数来获取玩家输入，`Logic` 函数来处理游戏逻辑。程序使用了一个数组 `tailX` 和 `tailY` 来记录蛇的身体，使用 `enum` 枚举类型来记录蛇的移动方向。在游戏中，玩家可以使用键盘上的 WASD 键来控制蛇的移动，X 键退出游戏。