Coding Challenge Day-27: Problem 1: TicTacToe Game

Hello! So I’m doing a 30 day coding challenge where I solve a few questions every day and thought of posting them here on my blog so that you guys can join the challenge too!

Welcome to Coding challenge Day 27: Problem 1! Be sure to post your answers, queries etc in the comments!

Problem: Write a program to simulate TicTacToe Game

Solution:

I learnt to make this game from here (though I have some variations in my version!):

My version has some shortcomings, but here’s what I came up with:

package Games;

import java.util.Scanner;

public class TicTacToe {

	public static void display(char[][] gameboard) {
		for (char[] c : gameboard) {
			for (char s : c) {
				System.out.print(s);
			}
			System.out.println();
		}
	}

	public static void place(char[][] gameboard, int pos, String user) {
		char symbol;
		
		if(user.equals("player")){
			symbol='X';
		} else {
			symbol='O';
		}
		
		switch (pos) {
		case 1: gameboard[0][0]= symbol;
		        break;
		case 2: gameboard[0][2]= symbol;
                break;
		case 3: gameboard[0][4]= symbol;
                break;
		case 4: gameboard[2][0]= symbol;
                break;
		case 5: gameboard[2][2]= symbol;
                break;
		case 6: gameboard[2][4]= symbol;
                break;
		case 7: gameboard[4][0]= symbol;
                break;
		case 8: gameboard[4][2]= symbol;
                break;
		case 9: gameboard[4][4]= symbol;
                break;
		}
	}
	
	public static String check_winner (char [][] gameboard){
		String winner=null;
		
		if(gameboard[0][0]=='X' && gameboard[0][2]=='X' && gameboard[0][4]=='X' ||
		   gameboard[2][0]=='X' && gameboard[2][2]=='X' && gameboard[2][4]=='X' ||  
		   gameboard[4][0]=='X' && gameboard[4][2]=='X' && gameboard[4][4]=='X' || 
		   gameboard[0][0]=='X' && gameboard[2][0]=='X' && gameboard[4][0]=='X' || 
		   gameboard[0][2]=='X' && gameboard[2][2]=='X' && gameboard[4][2]=='X' || 
		   gameboard[0][4]=='X' && gameboard[2][4]=='X' && gameboard[4][4]=='X' || 
		   gameboard[0][0]=='X' && gameboard[2][2]=='X' && gameboard[4][4]=='X' || 
		   gameboard[4][0]=='X' && gameboard[2][2]=='X' && gameboard[0][4]=='X')
			winner= "player";
		
		else if(gameboard[0][0]=='O' && gameboard[0][2]=='O' && gameboard[0][4]=='O' ||
				   gameboard[2][0]=='O' && gameboard[2][2]=='O' && gameboard[2][4]=='O' ||  
				   gameboard[4][0]=='O' && gameboard[4][2]=='O' && gameboard[4][4]=='O' || 
				   gameboard[0][0]=='O' && gameboard[2][0]=='O' && gameboard[4][0]=='O' || 
				   gameboard[0][2]=='O' && gameboard[2][2]=='O' && gameboard[4][2]=='O' || 
				   gameboard[0][4]=='O' && gameboard[2][4]=='O' && gameboard[4][4]=='O' || 
				   gameboard[0][0]=='O' && gameboard[2][2]=='O' && gameboard[4][4]=='O' || 
				   gameboard[4][0]=='O' && gameboard[2][2]=='O' && gameboard[0][4]=='O')
					winner= "computer";
		
		return winner;
	}
	
	public static int check_game(char [][] gameboard){
		int a=0;
		for(char[] c: gameboard){
			for(char ch: c){
				if(ch!=' ')
					a++;
			}
		}
		
		return a;
	}

	public static void main(String[] args) {
		char[][] gameboard = { { ' ', '|', ' ', '|', ' ' },
				{ '-', '+', '-', '+', '-' }, { ' ', '|', ' ', '|', ' ' },
				{ '-', '+', '-', '+', '-' }, { ' ', '|', ' ', '|', ' ' } };
		int userpos[]= new int[5];
		int a=-1, rand=0;
		System.out.println("Welcome to TicTacToe Simulation!p");
		boolean status=true;
		

		while(status && a<5){
			a++;
			Scanner obj = new Scanner(System.in);
			display(gameboard);
			
			System.out.println("Enter placement (1-9)");
			int playerpos = obj.nextInt();
			userpos[a]=playerpos;
			place(gameboard, playerpos, "player");
			
			boolean found=false;
			while (!found){
				found=true;
				rand= (int)(Math.random()*10);
				for(int i: userpos){
					if(rand==i)
						found=false;
				}
			}
			place(gameboard, rand, "computer");	
			
			String str= check_winner(gameboard);
			if(str!=null){
				display(gameboard);
				System.out.println("The Winner is : " + str);
				status= false;
			}
			
			if(check_game(gameboard)==9)
				status=false;	
		}
		
		System.out.println("Thanks for playing!");
		
		
	}
	
	

}

Download Code

Happy Learning!!