Snake Game in C

Below is a simple implementation of the Snake game in C. This console-based version captures the basic mechanics of the Snake game. Copy and paste this code and run it!

// Include stdio.h, conio.h, stdlib.h and windows.h             
#include 

int gameover, score;
int x, y, fruitX, fruitY, flag;

int width = 20;
int height = 10;

int tailX[100], tailY[100];
int nTail;

void setup()
{
    gameover = 0;

    // Initial position of the snake
    x = height / 2;
    y = width / 2;

    // Initial position of the fruit
    fruitX = rand() % height;
    fruitY = rand() % width;

    score = 0; // Initialize score to 0
}

void draw()
{
    system("cls");

    for (int i = 0; i < height; i++)
    {
        for (int j = 0; j < width; j++)
        {
            if (i == 0 || i == height - 1 || j == 0 || j == width - 1)
            {
                printf("#");
            }
            else if (i == x && j == y)
            {
                printf("O");
            }
            else if (i == fruitX && j == fruitY)
            {
                printf("F");
            }
            else
            {
                int isTail = 0;
                for (int k = 0; k < nTail; k++)
                {
                    if (tailX[k] == i && tailY[k] == j)
                    {
                        printf("o");
                        isTail = 1;
                    }
                }
                if (!isTail)
                    printf(" ");
            }
        }
        printf("\n");
    }

    printf("Score:%d", score);
    printf("\n");
}

void input()
{
    if (_kbhit())
    {
        switch (_getch())
        {
        case 'a':
            flag = 1;
            break;
        case 's':
            flag = 2;
            break;
        case 'd':
            flag = 3;
            break;
        case 'w':
            flag = 4;
            break;
        case 'x':
            gameover = 1;
            break;
        }
    }
}

void algorithm()
{
    Sleep(0.01);
    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;
    }
    switch (flag)
    {
    case 1:
        y--;
        break;
    case 2:
        x++;
        break;
    case 3:
        y++;
        break;
    case 4:
        x--;
        break;
    default:
        break;
    }

    if (x < 0 || x > height || y < 0 || y > width)
        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() % height;
        fruitY = rand() % width;
        nTail++;
    }
}

int main()
{
    int m, n;

    setup();
    while (!gameover)
    {
        draw();
        input();
        algorithm();
    }
    return 0;
}
                

Note that these functions are specific to the Windows environment. If you are on a different platform, you may need to find alternatives for handling keyboard input.