Question

Java project

In a game of tic-tac-toe, two players take turns marking an available cell in a 3 x 3 grid with their respective tokens (either X or O). When one player has placed three tokens in a horizontal, vertical, or diagonal row on the grid, the game is over and that player has won. A draw (no winner) occurs when all the cells on the grid have been filled with tokens and neither player has achieved a win. Create a program for playing tic-tac-toe.

The program prompts two players to enter an X token and O token alternately. Whenever a token is entered, the program redisplays the board on the console and determines the status of the game (win, draw, or continue). Here is a sample run:

Output:

--------------

| | | |

--------------

| | | |

--------------

| | | |

--------------

Enter a row (0, 1, or 2) for player X: 1

Enter a column (0, 1, or 2) for player X: 1

--------------

| | | |

--------------

| | X | |

--------------

| | | |

--------------

Enter a row (0, 1, or 2) for player O: 1

Enter a column (0, 1, or 2) for player O: 2

So on …

Answer 1

import java.util.Scanner;

public class TicTacToe {

public static void initializeBoard(char board[][]) {

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

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

board[i][j] = '*';

}

public static boolean validMove(char board[][], int x, int y) {

if (x < 0 || x > 2 || y < 0 || y > 2)

return false;

if (board[x][y] == 'X' || board[x][y] == 'O')

return false;

else

return true;

}

public static void displayBoard(char board[][]) {

int t;

for (t = 0; t < 3; t++) {

System.out.print(" " + board[t][0] + " | " + board[t][1] + " | " + board[t][2]);

if (t != 2)

System.out.print("\n---|---|---\n");

}

System.out.println();

}

// public static void getInput(char board[][], char marker, int x, int y) {

//

// }

public static void markBoard(char board[][], int x, int y, char marker) {

board[x][y] = marker;

}

public static boolean gameOver(char board[][]) {

if (checkHorizontal(board, 'X')) {

printWinner('X');

return true;

}

if (checkVertical(board, 'X')) {

printWinner('X');

return true;

}

if (checkDiagonal(board, 'X')) {

printWinner('X');

return true;

}

if (checkHorizontal(board, 'O')) {

printWinner('O');

return true;

}

if (checkVertical(board, 'O')) {

printWinner('O');

return true;

}

if (checkDiagonal(board, 'O')) {

printWinner('O');

return true;

}

if (checkTie(board)) {

printWinner('T');

return true;

}

return false;

}

public static boolean checkHorizontal(char board[][], char marker) {

int i, j, count;

for (i = 0; i < 3; i++) {

count = 0;

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

if (board[i][j] == marker)

count++;

if (count == 3)

return true;

}

return false;

}

public static boolean checkVertical(char board[][], char marker) {

int i, j, count;

for (i = 0; i < 3; i++) {

count = 0;

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

if (board[j][i] == marker)

count++;

if (count == 3)

return true;

}

return false;

}

public static boolean checkDiagonal(char board[][], char marker) {

if (board[0][0] == board[1][1] && board[1][1] == board[2][2] && board[0][0] == marker)

return true;

if (board[0][2] == board[1][1] && board[1][1] == board[2][0] && board[0][2] == marker)

return true;

return false;

}

public static boolean checkTie(char board[][]) {

int i, j;

for (i = 0; i < 3; i++)

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

if (board[i][j] == '*')

return false;

return true;

}

public static void printWinner(char marker) {

if (marker == 'T')

System.out.println("TIE GAME!\n");

else

System.out.println("The winner is " + marker + " !!!\n");

}

public static void main(String[] args) {

// TODO Auto-generated method stub

// srand(time(0));

// int start=rand()%2;

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

char exit;

char f, s;

int x = 0, y = 0;

f = 'X';

s = 'O';

initializeBoard(board);

displayBoard(board);

Scanner sc = new Scanner(System.in);

while (true) {

// getInput(board, f, x, y);

for (;;) {

System.out.print("Player " + f + " Enter a Row and Column (between 1-3): ");

x = sc.nextInt();

y = sc.nextInt();

x--;

y--;

if (validMove(board, x, y))

break;

System.out.print("Invalid Move: Please Try Again\n\n");

}

markBoard(board, x, y, f);

displayBoard(board);

if (gameOver(board))

break;

for (;;) {

System.out.print("Player " + f + " Enter a Row and Column (between 1-3): ");

x = sc.nextInt();

y = sc.nextInt();

x--;

y--;

if (validMove(board, x, y))

break;

System.out.print("Invalid Move: Please Try Again\n\n");

}

markBoard(board, x, y, s);

displayBoard(board);

if (gameOver(board))

break;

}

}

}
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SEE OUTPUT


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