How to make the computer generate a random number for a move for \'O\' in tic ta

Question

How to make the computer generate a random number for a move for 'O' in tic tac toe java game

Fix the program that I wrote please

import java.lang.Math;

import javax.swing.JOptionPane;

class random

{

  

private static int random;

public static void main(String args[])

{

char[][] board=new char[3][3];

for(int i=0;i<9;i++)

board[i/3][i%3]=' ';

  

char c='X';

int y;

  

  

for(int i=0;i<9;i++)

{

y =Integer.parseInt(JOptionPane.showInputDialog("Please pick a square (1-9)"));

  

y--;

while(board[y/3][y%3]!=' ') {

int random = (int)(Math.random()* 9 ) + 1;

  

}

  

while(board[y/3][y%3]!=' ')

{

y=Integer.parseInt(JOptionPane.showInputDialog("Square already filled. Please pick a different square (1-9)"));

y--;

}

  

board[y/3][y%3]=c;

  

   // 4 times random

  

if(c=='X') {

board[random][random] = c;

c = 'O';

  

} else {

c='X';

  

  

}

//printing board

System.out.println("BOARD:");

System.out.println("-------");

for(int j=0;j<3;j++)

{

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

System.out.println("-------");

}

System.out.println();

}

}

  }

Explanation / Answer

//The program is working perfectly as expected. I have added comments wherever I made changes and wherever code requires attention.

import java.lang.Math;

import javax.swing.JOptionPane;

class random

{

private static int random;

public static void main(String args[])

{

char[][] board=new char[3][3];

for(int i=0;i<9;i++){

board[i/3][i%3]=' ';

}

char c='X';

int y;

int random = (int)(Math.random()* 9 );

int numEmptySquares = 9;//Needed to keep a count of number of empty squares left.

  

//Continue the procedure until all squares are filled

while(numEmptySquares > 0)

{

y =Integer.parseInt(JOptionPane.showInputDialog("Please pick a square (1-9)"));

y--;

  

//First ask the user to input a square position. Continue to ask until an empty square is entered

while(board[y/3][y%3]!=' ') {

System.out.println("Random!!!!");

y=Integer.parseInt(JOptionPane.showInputDialog("Square already filled. Please pick a different square (1-9)"));

y--;

}

//mark the position entered by user as 'X' or 'O'

board[y/3][y%3]=c;

//Decrease the left number of empty squares

numEmptySquares--;

  

//Now, randomly pick a square. Keep generating random number until an empty square is not picked.

//Don't generate random number if no empty square is left. It means game is over

while(board[random/3][random%3]!=' ' && numEmptySquares > 0) {

random = (int)(Math.random()* 9 );

}

  

//Mark the randomly picked empty square as opposite of user's choice 'X' or 'O'

//Don't mark the board if no empty square is left

if(c=='X' && numEmptySquares > 0) {

board[random/3][random%3] = 'O';

numEmptySquares--;

} else if(c=='O' && numEmptySquares > 0) {

board[random/3][random%3] = 'X';

}

//printing board

System.out.println("BOARD:");

System.out.println("-------");

for(int j=0;j<3;j++)

{

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

System.out.println("-------");

}

System.out.println();

}

}

}

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