Answered: ODY OF Java program - THE checkWinner…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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WRITE THE BODY OF Java program - THE checkWinner METHOD BELOW SO THAT THE GAME STOPS WHEN SOMEONE WINS, OR WHEN THE BOARD IS FULL. AS SHOWN IN THE SAMPLE OUTPUT AT THE BOTTOM. Code: import java.util.Scanner; public class TicTacBoard { private char[][] board; // 2-D array of characters private char curPlayer; // the player whose turn it is (X or O) // Constructor: board will be size x size public TicTacBoard(int size) { board = new char[size][size]; // initialize the board with all spaces: for(int row=0; row < board.length; row++) for(int col=0; col < board[row].length; col++) board[row][col] = ' '; curPlayer = 'X'; // X gets the first move } public void playGame() { display(); do { takeTurn(); display(); }while(!checkWinner()); } /////// display //////// // Display the current status of the board on the // screen, using hyphens (-) for horizontal lines // and pipes (|) for vertical lines. public void display() { System.out.println(); dispRow(0); System.out.println("-----"); dispRow(1); System.out.println("-----"); dispRow(2); System.out.println(); } // Display the current status of row r of the board // on the screen, using hyphens (-) for horizontal // lines and pipes (|) for vertical lines. private void dispRow(int r) { System.out.println(board[r][0] + "|" + board[r][1] + "|" + board[r][2]); } /////// takeTurn //////// // Allow the curPlayer to take a turn. // Send output to screen saying whose turn // it is and specifying the format for input. // Read user's input and verify that it is a // valid move. If it's invalid, make them // re-enter it. When a valid move is entered, // put it on the board. public void takeTurn() { Scanner scan = new Scanner(System.in); int row, col; boolean invalid; do{ invalid = false; // assume correct entry System.out.println("It is now " + curPlayer + "'s turn."); System.out.println("Please enter your move in the form row column."); System.out.println("So 0 0 would be the top left, and 0 2 would be the top right."); row = scan.nextInt(); col = scan.nextInt(); if(row < 0 || col < 0 || row > 2 || col > 2) { System.out.println("Invalid entry: row and column must both be between 0 and 2 (inclusive)."); System.out.println("Please try again."); invalid = true; } else if(board[row][col] != ' ') { System.out.println("Invalid entry: Row " + row + " at Column " + col + " already contains: " + board[row][col]); System.out.println("Please try again."); invalid = true; } }while(invalid); board[row][col] = curPlayer; if(curPlayer == 'X') curPlayer = 'O'; else curPlayer = 'X'; } // If the game is over, print who won (if anyone), // and return true. If the game is not over, return false. public boolean checkWinner() { // YOUR CODE GOES HERE } } /* Sample Output: | | ----- | | ----- | | It is now X's turn. Please enter your move in the form row column. So 0 0 would be the top left, and 0 2 would be the top right. 0 0 X| | ----- | | ----- | | It is now O's turn. Please enter your move in the form row column. So 0 0 would be the top left, and 0 2 would be the top right. 2 0 X| | ----- | | ----- O| | It is now X's turn. Please enter your move in the form row column. So 0 0 would be the top left, and 0 2 would be the top right. 1 1 X| | ----- |X| ----- O| | It is now O's turn. Please enter your move in the form row column. So 0 0 would be the top left, and 0 2 would be the top right. 2 1 X| | ----- |X| ----- O|O| It is now X's turn. Please enter your move in the form row column. So 0 0 would be the top left, and 0 2 would be the top right. 2 2 X| | ----- |X| ----- O|O|X Player X wins! */

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