***8.9 (Game: play a tic-tac-toe game) In a game of tic-tac-toe, two players take turns marking an available cell in a 3 * 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:
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Enter a row (0, 1, or 2) for player X: 1
Enter a column (0, 1, or 2) for player X: 1
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| |X| |
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Enter a row (0, 1, or 2) for player O: 1
Enter a column (0, 1, or 2) for player O: 2
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| |X|O|
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Enter a row (0, 1, or 2) for player X: 1
Enter a column (0, 1, or 2) for player X: 1
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| |X| |
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Enter a row (0, 1, or 2) for player O: 1
Enter a column (0, 1, or 2) for player O: 2
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| |X|O|
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import java.util.Scanner; /* Strategies: * 1. Create 3x3 array of character to represent the board * 2. Function to display the board * 3. Function to check if there is a winner. Return winner, X or O. Return 'N' if there is no winner. Return 'F' if the board is full without any winner */ public class ProgrammingEx8_9 { public static void main(String[] args) { Scanner input = new Scanner(System.in); char[][] board = new char[3][3]; char player = 'X'; char status; int row, col; displayBoard(board); while ((status = checkBoard(board)) == 'N') { System.out.print("Enter a row (0, 1, or 2) for player " + player + ":"); row = input.nextInt(); System.out.print("Enter a column (0, 1, or 2) for player " + player + ":"); col = input.nextInt(); if (board[col][row] != '\u0000') { System.out.println("The row and column is occupied."); continue; } else { board[col][row] = player; if (player == 'O') { player = 'X'; } else { player = 'O'; } } displayBoard(board); } if(status == 'F') System.out.println("It is a draw."); else System.out.println("The winner is " + status); } public static char checkBoard(char board[][]) { char status = 'F'; // Check if the board is full outer: for (int i = 0; i < board.length; i++) { for (int j = 0; j < board[0].length; j++) { if (board[i][j] == '\u0000') { status = 'N'; break outer; } } } // Check column 1 if (board[0][0] == board[0][1] && board[0][0] == board[0][2] && board[0][0] != '\u0000') { status = board[0][0]; } // Check column 2 if (board[1][0] == board[1][1] && board[1][0] == board[1][2] && board[1][0] != '\u0000') { status = board[1][0]; } // Check column 3 if (board[2][0] == board[2][1] && board[2][0] == board[2][2] && board[2][0] != '\u0000') { status = board[2][0]; } // Check row 1 if (board[0][0] == board[1][0] && board[0][0] == board[2][0] && board[0][0] != '\u0000') { status = board[0][0]; } // Check row 2 if (board[0][1] == board[1][1] && board[0][1] == board[2][1] && board[0][1] != '\u0000') { status = board[0][1]; } // Check row 3 if (board[0][2] == board[1][2] && board[0][2] == board[2][2] && board[0][2] != '\u0000') { status = board[0][2]; } // Check diagonal 1 if (board[0][0] == board[1][1] && board[0][0] == board[2][2] && board[0][0] != '\u0000') { status = board[0][0]; } // Check diagonal 2 if (board[2][0] == board[1][1] && board[2][0] == board[0][2] && board[2][0] != '\u0000') { status = board[0][0]; } return status; } public static void displayBoard(char board[][]) { for (int i = 0; i < board.length; i++) { for (int j = 0; j < board[1].length; j++) { System.out.print("|" + board[j][i]); } System.out.println("|"); } } }
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