Tic Tac Toe = Naming Winning Player & Restarting Program

**Override** · November 26th, 2010, 08:36 PM

Hey,

So I have been working on a project for a simple console Tic Tac Toe game, and I'm pretty much all set with the code. However, I have two small problems, and that's where I turn to you guys.

First off, here's my code:

 
package anthonytictactoe;
import java.util.Scanner;
 
public class Main {
 
    public static void main(String[] args) {
        int row;
        int col;
        char X;
        char O;
        boolean winner = false;
        Scanner in = new Scanner(System.in);
        System.out.println("Welcome to Tic Tac Toe!");
        System.out.println("Instructions: The top row is 0, middle is 1, "
                + "and bottom is 2.");
        System.out.println("The leftmost column is 0, the middle is 1, "
                + "and the rightmost is 2.");
 
        char[][] x = new char [3][3];
 
 
          for(row = 0; row < 3; row++){
              for(col = 0; col < 3; col++){
                  x[row][col] = '*';
              }
        }
          for(row = 0; row < 3; row++){
               for(col = 0; col < 3; col++){
                  System.out.print(x[row][col] + " ");
 
          }
               System.out.println();
          }
       do{
         do{
          System.out.print("Player X, what row?: ");
              row = in.nextInt();
          System.out.print("Player X, what column?: ");
              col = in.nextInt();
            if (x[row][col] == 'X' || x[row][col] == 'O'){
             System.out.println("Space is already taken, choose again.");
             x[row][col] = 10;}
 
 
         } while (x[row][col] == 10);
 
        x[row][col] = 'X';
        for (row = 0; row < 3; row++){
            for(col = 0; col < 3; col++){
                System.out.print(x[row][col] + " ");
            }
              System.out.println();
        }
        //Check to see if there is a winner
 
        if (x[0][0] == 'X' && x[0][1] == 'X' && x[0][2] == 'X')
            winner = true;
        else if (x[1][0] == 'X' && x[1][1] == 'X' && x[1][2] == 'X')
            winner = true;
        else if (x[2][0] == 'X' && x[2][1] == 'X' && x[2][2] == 'X')
            winner = true;
        else if (x[0][0] == 'X' && x[1][0] == 'X' && x[2][0] == 'X')
            winner = true;
        else if (x[0][1] == 'X' && x[1][1] == 'X' && x[2][1] == 'X')
            winner = true;
        else if (x[0][2] == 'X' && x[1][2] == 'X' && x[2][2] == 'X')
            winner = true;
        else if (x[0][0] == 'X' && x[1][1] == 'X' && x[2][2] == 'X')
            winner = true;
        else if (x[0][2] == 'X' && x[1][1] == 'X' && x[2][0] == 'X')
            winner = true;
 
        do{
          System.out.print("Player O, what row?: ");
              row = in.nextInt();
          System.out.print("Player O, what column?: ");
              col = in.nextInt();
            if (x[row][col] == 'X' || x[row][col] == 'O'){
             System.out.println("Space is already taken, choose again.");
             x[row][col] = 10;}
 
         } while (x[row][col] == 10);
 
        x[row][col] = 'O';
        for (row = 0; row < 3; row++){
            for (col = 0; col < 3; col++){
               System.out.print(x[row][col] + " ");
            }
          System.out.println();
        }
        //check for winner again
 
         if (x[0][0] == 'O' && x[0][1] == 'O' && x[0][2] == 'O')
            winner = true;
        else if (x[1][0] == 'O' && x[1][1] == 'O' && x[1][2] == 'O')
            winner = true;
        else if (x[2][0] == 'O' && x[2][1] == 'O' && x[2][2] == 'O')
            winner = true;
        else if (x[0][0] == 'O' && x[1][0] == 'O' && x[2][0] == 'O')
            winner = true;
        else if (x[0][1] == 'O' && x[1][1] == 'O' && x[2][1] == 'O')
            winner = true;
        else if (x[0][2] == 'O' && x[1][2] == 'O' && x[2][2] == 'O')
            winner = true;
        else if (x[0][0] == 'O' && x[1][1] == 'O' && x[2][2] == 'O')
            winner = true;
        else if (x[0][2] == 'O' && x[1][1] == 'O' && x[2][0] == 'O')
            winner = true;
 
       } while (!winner);
 
        System.out.print("The game is over!");
        System.out.print("Play again? (1 for yes, 2 for no: ");
 
           }
}

What I'm looking for is a recommendation on what kind of loop I should use to give the user the option to play again, or exit the program.

I'm also looking for a way to name the winning player after they win.

Any suggestions would be helpful.

Thanks a lot,

Override

**helloworld922** · November 26th, 2010, 10:47 PM

Sounds like what you want is a while loop (or a do-while loop if you want them to play once before asking them if they want to play again). Create a flag which would denote if the user wants to play again or not. Then ask them if they would like to play again. If they say yes, set the flag to make the loop conditional true. If not, set it to make the loop conditional false.

Also, it would make it a lot easier to manage your code if you moved the actual playing of the game out to a helper method.

For example:

boolean keeyPlaying = true;
// this is a do-while loop example
// the user will play the game once before being asked if they want to play again
do
{
    playTicTacToe(); // helper method which plays a game of tic-tac-toe
    // game is over here
    // TODO: ask the user if they want to keep playing
    if(/* TODO: some conditional check on the user input saying they want to play again*/)
    {
        keepPlaying = true;
    }
    else
    {
        keepPlaying = false;
    }
}
while(keepPlaying);

**Override** · November 28th, 2010, 12:20 AM

Thanks a lot, I used your idea to set a flag, and use another loop. It works great. I also tried putting the playing of the game into a method, but it kept giving me errors. Not sure why. My last question is actually how I would approach setting a stalemate? Would that just be another If statement under each "check for winner" 's?

Here's my new code:

package anthonytictactoe;
import java.util.Scanner;
 
public class Main {
 
    public static void main(String[] args) {
        int row;
        int col;
        char X;
        char O;
        boolean winner = false;
        boolean keepPlaying = true;
        Scanner in = new Scanner(System.in);
        System.out.println("Welcome to Tic Tac Toe!");
        System.out.println("Instructions: The top row is 0, middle is 1, "
                + "and bottom is 2.");
        System.out.println("The leftmost column is 0, the middle is 1, "
                + "and the rightmost is 2.");
 
      do{
        char[][] x = new char [3][3];
 
        //Print the board
          for(row = 0; row < 3; row++){
              for(col = 0; col < 3; col++){
                  x[row][col] = '*';
              }
        }
          for(row = 0; row < 3; row++){
               for(col = 0; col < 3; col++){
                  System.out.print(x[row][col] + " ");
 
          }
               System.out.println();
          }
       do{
         do{
          System.out.print("Player X, what row?: ");
              row = in.nextInt();
          System.out.print("Player X, what column?: ");
              col = in.nextInt();
            if (x[row][col] == 'X' || x[row][col] == 'O'){
             System.out.println("Space is already taken, choose again.");
             x[row][col] = 10;}
 
 
         } while (x[row][col] == 10);
 
        x[row][col] = 'X';
        for (row = 0; row < 3; row++){
            for(col = 0; col < 3; col++){
                System.out.print(x[row][col] + " ");
            }
              System.out.println();
        }
        //Check to see if there is a winner
 
        if (x[0][0] == 'X' && x[0][1] == 'X' && x[0][2] == 'X'){
            System.out.println("Player X Wins!");
            winner = true;}
        else if (x[1][0] == 'X' && x[1][1] == 'X' && x[1][2] == 'X'){
            winner = true;
            System.out.println("Player X Wins!");}
        else if (x[2][0] == 'X' && x[2][1] == 'X' && x[2][2] == 'X'){
            System.out.println("Player X Wins!");
            winner = true;}
        else if (x[0][0] == 'X' && x[1][0] == 'X' && x[2][0] == 'X'){
       System.out.println("Player X Wins!");
            winner = true;}
        else if (x[0][1] == 'X' && x[1][1] == 'X' && x[2][1] == 'X'){
           System.out.println("Player X Wins!");
            winner = true;}
        else if (x[0][2] == 'X' && x[1][2] == 'X' && x[2][2] == 'X'){
            System.out.println("Player X Wins!");
            winner = true;}
        else if (x[0][0] == 'X' && x[1][1] == 'X' && x[2][2] == 'X'){
            System.out.println("Player X Wins!");
            winner = true;}
        else if (x[0][2] == 'X' && x[1][1] == 'X' && x[2][0] == 'X'){
            System.out.println("Player X Wins!");
            winner = true;}
 
        do{
          System.out.print("Player O, what row?: ");
              row = in.nextInt();
          System.out.print("Player O, what column?: ");
              col = in.nextInt();
            if (x[row][col] == 'X' || x[row][col] == 'O'){
             System.out.println("Space is already taken, choose again.");
             x[row][col] = 10;}
 
         } while (x[row][col] == 10);
 
        x[row][col] = 'O';
        for (row = 0; row < 3; row++){
            for (col = 0; col < 3; col++){
               System.out.print(x[row][col] + " ");
            }
          System.out.println();
        }
        //check for winner again
 
         if (x[0][0] == 'O' && x[0][1] == 'O' && x[0][2] == 'O'){
             System.out.println("Player O Wins!");
            winner = true;}
        else if (x[1][0] == 'O' && x[1][1] == 'O' && x[1][2] == 'O'){
            System.out.println("Player O Wins!");
            winner = true;}
        else if (x[2][0] == 'O' && x[2][1] == 'O' && x[2][2] == 'O'){
            System.out.println("Player O Wins!");
            winner = true;}
        else if (x[0][0] == 'O' && x[1][0] == 'O' && x[2][0] == 'O'){
            System.out.println("Player O Wins!");
            winner = true;}
        else if (x[0][1] == 'O' && x[1][1] == 'O' && x[2][1] == 'O'){
            System.out.println("Player O Wins!");
            winner = true;}
        else if (x[0][2] == 'O' && x[1][2] == 'O' && x[2][2] == 'O'){
            System.out.println("Player O Wins!");
            winner = true;}
        else if (x[0][0] == 'O' && x[1][1] == 'O' && x[2][2] == 'O'){
            System.out.println("Player O Wins!");
            winner = true;}
        else if (x[0][2] == 'O' && x[1][1] == 'O' && x[2][0] == 'O'){
            System.out.println("Player O Wins!");
            winner = true;}
 
           } while (!winner);
 
       System.out.println("Game is over! Do you want to play again?");
       System.out.print("(1 for Yes, 2 for No): ");
       int keepplayinggame = in.nextInt();
 
         if(keepplayinggame == 1){
           keepPlaying = true;
                                 }
         else if(keepplayinggame == 2){
           keepPlaying = false;
                                 }
 
 
 
      }while (keepPlaying);     
}
}

Override

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