How to display arrays

Question

I'm trying to display a array board for my tic-tac-toe game.

The board is supposed to look like this:

123

456

789

However when I run the program it shows up like this:

150

159

168

My Code:

 class TicTacToe


{
    public static void main(String[] args)
    { 
       char [][] board = {{'1','2','3'}, {'4','5','6'}, {'7', '8', '9'}};

        System.out.println(board[0][0] + board[0][1] + board[0][2]);
        System.out.println(board[1][0] + board[1][1] + board[1][2]);
        System.out.println(board[2][0] + board[2][1] + board[2][2]);


   }
}

Rod_Algonquin · Accepted Answer · 2015-04-28 20:53:25Z

5

Those values you see are the addition/sum of the character in there decimal values in the ascii table:

'1' = 49
'2' = 50
'3' = 51

equals

150

What you need to do is add/append an empty string instead of adding the characters decimal value

System.out.println(board[0][0] +""+ board[0][1] + board[0][2]);

edited Apr 28, 2015 at 20:53

answered Apr 28, 2015 at 20:47

Rod_Algonquin

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1 Comment

MadProgrammer Over a year ago

Or use a String array instea, but what ever ;)

rgettman · Accepted Answer · 2015-04-28 20:47:59Z

3

This is a consequence of the fact that the char values you're attempting to print are being added mathematically instead of being concatenated. The Unicode values of the chars representing the numbers '0' through '9' are 48 through 57, respectively.

So, adding '1', '2', and '3' means adding 49, 50, and 51, which sums to 150, which is printed.

Include an empty string at the beginning, so that String conversion takes place as the values are concatenated from left to right, and that the chars are added as you expect, e.g.:

System.out.println("" + board[0][0] + board[0][1] + board[0][2]);

answered Apr 28, 2015 at 20:47

rgettman

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Comments

MaxZoom · Accepted Answer · 2015-04-28 21:18:45Z

1

You are printing the sum of character code (see ASCI table) 1=49 2=50 3=51
49 + 50 + 51 = 150

To print character representation indicate the string concatenation as below:

class TicTacToe
{
   public static void main(String[] args)
   { 
     char [][] board = {{'1','2','3'}, {'4','5','6'}, {'7', '8', '9'}};
     System.out.println("" + board[0][0] + board[0][1] + board[0][2]);
     System.out.println("" + board[1][0] + board[1][1] + board[1][2]);
     System.out.println("" + board[2][0] + board[2][1] + board[2][2]);
   } 
}

edited Apr 28, 2015 at 21:18

answered Apr 28, 2015 at 21:11

MaxZoom

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Comments

Daedric · Accepted Answer · 2015-04-29 12:19:06Z

1

This is a much more efficient method (takes all the manual work out) that will blitz through larger array tables with ease and yours as well (it may look complex but give it a quick look):

class TicTacToe {
    public static void main(String[] args) { 
       char [][] board = {{'1','2','3'}, {'4','5','6'}, {'7', '8', '9'}};

        for (int i = 0; i < board.length; i++) {       //loop rows

           for (int j = 0; j < board[0].length; j++) { //loop columns
              System.out.print(board[i][j]);           //print columns
           }
           System.out.println();                       //print space for the next row
        }
   }
}

edited Apr 29, 2015 at 12:19

answered Apr 28, 2015 at 21:05

Daedric

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