snake.c

#include <stdio.h>
#include <conio.h> //_kbhit(), _getch()
#include <stdlib.h> //system()
#include <time.h>
#include <windows.h> //Sleep()

const int width = 20, height = 20;
int x, y, foodX, foodY, score;
int gameOver;
int tailX[100], tailY[100];
int nTail;

enum eDirection { STOP = 0, LEFT, RIGHT, UP, DOWN }; //0,1,2,3,4
enum eDirection dir;

void Setup() {
    gameOver = 0; //if 1 , exit
    dir = STOP;
    //finding center point
    x = width / 2;
    y = height / 2;

    foodX = rand() % width;
    foodY = rand() % height;
    score = 0;
}

void Draw() {
    system("cls"); // Clear screen

    for (int i = 0; i < width + 2; i++)
        printf("#"); // Top wall
    printf("\n");

    for (int i = 0; i < height; i++) {
        for (int j = 0; j < width; j++) {
            if (j == 0)
                printf("#"); // Left wall
            if (i == y && j == x)
                printf("O"); // Snake head
            else if (i == foodY && j == foodX)
                printf("F"); // Food
            else {
                int print = 0;
                for (int k = 0; k < nTail; k++) {
                    if (tailX[k] == j && tailY[k] == i) {
                        printf("o"); // Snake tail
                        print = 1;
                    }
                }
                if (!print)
                    printf(" "); // Empty space
            }

            if (j == width - 1)
                printf("#"); // Right wall
        }
        printf("\n");
    }

    for (int i = 0; i < width + 2; i++)
        printf("#"); // Bottom wall
    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];
    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 (dir) {
        case LEFT:
            x--;
            break;
        case RIGHT:
            x++;
            break;
        case UP:
            y--;
            break;
        case DOWN:
            y++;
            break;
        default:
            break;
    }

    // Check for collision with walls
    if (x >= width) x = 0; else if (x < 0) x = width - 1;
    if (y >= height) y = 0; else if (y < 0) y = height - 1;

    // Check for collision with tail
    for (int i = 0; i < nTail; i++) {
        if (tailX[i] == x && tailY[i] == y)
            gameOver = 1;
    }

    // Check if snake eats food
    if (x == foodX && y == foodY) {
        score += 10;
        foodX = rand() % width;
        foodY = rand() % height;
        nTail++;
    }
}

int main() {
    Setup();
    while (!gameOver) {
        Draw();
        Input();
        Logic();
        Sleep(100); // Slow down the game loop
    }
    return 0;
}