Question

Write a Java program to play the game Tic-Tac-Toe. Start off with a human playing a human, so each player makes their own moves.

Follow the design below, creating the methods indicated and invoking them in the main program.

Use a char array of size 9 as the board; initialize with the characters 0 to 8 so that it starts out looking something like the board on the left.

0|1|2 3|4|5 6|7|8

and then as moves are entered the board looks like this

0|O|2 3|X|5 6|X|O

Make sure the board lines up properly so that the entries and borders all line up properly. DO NOT print a board that looks like or is similar to the output below where columns are misaligned.

0| O|2

3|X | 5

6 | X|O

You will need a variable to keep track of whose turn it is. Use a char variable named turn and initialize to X when the game starts. After a move, if there is no winner and no draw, switch to the O and continue to take turns as the game progresses. Declare additional variables as you build your program.

1. After the variable declarations, begin a while loop which will keep the game going the user indicates to stop the game. (see a. below)
   1. When a new games starts, allow the user to terminate the program by entering an S or s (remember String has toLowerCase and toUpperCase methods). Any other entry will start a new game.
2. If you are starting a new game, invoke a method to initialize the board and turn and another method to print the board
3. Start an inner while loop that runs as long as the game isn’t over (a win or draw will terminate the game but not the program).
4. Invoke a method to allow the user to make a move
   1. If there is no empty spot, (the game is a draw), print a message and ask the user whether to start a new game or terminate the program
   2. If the value entered is invalid (not 0 to 8), print a message and allow the user to re-enter a move
   3. If the user enters a value but it’s already taken, print a message and allow the user to retry
   4. If the user enters a value and it’s available, set the spot to X or O (depending upon the value of turn) and print the board
5. After a valid move is made, invoke a method to check if the last one to make a move won the game
   • Winner - print the winner and start a new game
   • No winner - switch turn and ask for the next position

SAMPLE OUTPUT – NOTE OUTPUT BOLDED TO SHOW HANDLING OF BAD ENTRIES

Enter S to stop game, any other letter to play x Starting new game 0|1|2 3|4|5 6|7|8 Enter move, a number between 0 and 8 5 0|1|2 3|4|X 6|7|8 Enter move, a number between 0 and 8 5 Spot is taken, choose another Enter move, a number between 0 and 8 0 O|1|2 3|4|X 6|7|8 Enter move, a number between 0 and 8 4 O|1|2 3|X|X 6|7|8 Enter move, a number between 0 and 8 2 O|1|O 3|X|X 6|7|8 Enter move, a number between 0 and 8 3 O|1|O X|X|X 6|7|8 X is the winner Enter S to stop game, any other letter to play x Starting new game 0|1|2 3|4|5 6|7|8

Enter move, a number between 0 and 8 0 X|1|2 3|4|5 6|7|8 Enter move, a number between 0 and 8 3 X|1|2 O|4|5 6|7|8 Enter move, a number between 0 and 8 9 9 is not a valid choice Enter move, a number between 0 and 8 z z is not a valid choice Enter move, a number between 0 and 8 6 X|1|2 O|4|5 X|7|8 Enter move, a number between 0 and 8 1 X|O|2 O|4|5 X|7|8 Enter move, a number between 0 and 8 5 X|O|2 O|4|X X|7|8 Enter move, a number between 0 and 8 8 X|O|2 O|4|X X|7|O Enter move, a number between 0 and 8 4 X|O|2 O|X|X X|7|O Enter move, a number between 0 and 8 2 X|O|O O|X|X X|7|O Enter move, a number between 0 and 8 7 X|O|O O|X|X X|X|O Game is a draw Enter S to stop game, any other letter to play

Answer 1

Ans:-

Code-

Main.java-

import java.util.*;

public class Main

{

//initialize class variable

private int counter;

private char position[]=new char[10];

private char player;

Random r = new Random();

//main function

public static void main(String args[])

{

char ch;

Scanner in =new Scanner(System.in);

System.out.println ("Enter S to stop game, any other letter to play ");//after game complete ask player if he want to play again or not

ch=in.next().charAt(0);

if(ch == 's' || ch == 'S' )

System.exit(0);

//create object for toe class

Main Toe=new Main();

do{

//get new board

System.out.println("Starting new game");

Toe.new_board();

Toe.get_move();//get the move from player

System.out.println ("Enter S to stop game, any other letter to play ");//after game complete ask player if he want to play again or not

ch=in.next().charAt(0);

}while (ch!='s'&&ch!='S');

  

  

}

public void new_board()

{

//initialize new board with all values '1'

char posndef[] = {'0','1', '2', '3', '4', '5', '6', '7', '8'};

int i;

counter = 0;

player = 'X';

for (i=0; i<9; i++) position[i]=posndef[i];

print_board();

  

  

}

//method to print the board

public String print_board()

{

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

System.out.println(position [3]+"|"+position [4]+"|" +position [5]);

System.out.println(position [6]+"|"+position [7]+"|" +position [8]);

return " print_board";

}

//method to ask user to get the mover the player O or X

public void get_move()

{

int spot;

char blank = ' ';

  

do {

// display current board-

  

System.out.println("Enter move, a number between 0 and 8 ");

print_board();

boolean posTaken = true;

while (posTaken) {

Scanner in =new Scanner (System.in);

spot=in.nextInt();

while(spot>8 || spot<0){

System.out.println(spot+" is not a valid choice");

System.out.println("Enter move, a number between 0 and 8 ");

spot=in.nextInt();

}

posTaken = check_position(spot);

if(posTaken==false)

position[spot]=get_player();

}

  

// display current board

if(player=='X')

print_board();

  

if (player == 'O')

player = 'X';

else player = 'O';

}while ( check_win () == blank );

  

}

//fucntion- to calculate win

public char check_win ()

{

char Winner = ' ';

  

// condition to check if O wins

if (position[0] == 'O' && position[1] == 'O' && position[2] == 'O') Winner = 'O';

if (position[3] == 'O' && position[4] == 'O' && position[5] == 'O') Winner = 'O';

if (position[6] == 'O' && position[7] == 'O' && position[8] == 'O') Winner = 'O';

if (position[0] == 'O' && position[3] == 'O' && position[6] == 'O') Winner = 'O';

if (position[1] == 'O' && position[4] == 'O' && position[7] == 'O') Winner = 'O';

if (position[2] == 'O' && position[5] == 'O' && position[8] == 'O') Winner = 'O';

if (position[0] == 'O' && position[4] == 'O' && position[8] == 'O') Winner = 'O';

if (position[2] == 'O' && position[4] == 'O' && position[6] == 'O') Winner = 'O';

if (Winner == 'O' )

{System.out.println("Player O wins the game." );

return Winner;

}

  

// condtion to check if X wins

if (position[0] == 'X' && position[1] == 'X' && position[2] == 'X') Winner = 'X';

if (position[3] == 'X' && position[4] == 'X' && position[5] == 'X') Winner = 'X';

if (position[6] == 'X' && position[7] == 'X' && position[8] == 'X') Winner = 'X';

if (position[0] == 'X' && position[3] == 'X' && position[6] == 'X') Winner = 'X';

if (position[1] == 'X' && position[4] == 'X' && position[7] == 'X') Winner = 'X';

if (position[2] == 'X' && position[5] == 'X' && position[8] == 'X') Winner = 'X';

if (position[0] == 'X' && position[4] == 'X' && position[8] == 'X') Winner = 'X';

if (position[2] == 'X' && position[4] == 'X' && position[6] == 'X') Winner = 'X';

if (Winner == 'X' )

{

System.out.println( "Player X wins the game." );

return Winner; }

  

// check for Draw

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

{

if(position[i]=='O' || position[i]=='X')

{

if(i==8)

{

char Draw='D';

System.out.println(" Game is draw ");

return Draw;

}

continue;

}

else

break;

  

}

  

return Winner;

}

//check for position that the position is already taken or not

public boolean check_position(int spot)

{

  

  

if ( position[spot] == 'O'||position[spot] == 'X')

{

if(player=='X')

System.out.println("Spot is taken, choose another");

return true;

}

else {

return false;

}

  

}

//method to get the current player

public char get_player()

{

return player;

}

  

}
Enter S to stop game, any other letter to play d Starting new game 01112 31415 61718 Enter move, a number between 0 and 8 01112 31415 61718 19 19 is not a valid choice Enter move, a number between 0 and 8 12 12 is not a valid choice Enter move, a number between 0 and 8 15 15 is not a valid choice Enter move, a number between 0 and 8 10 10 is not a valid choice Enter move, a number between 0 and 8 01X2 31415 61718

Enter move, a number between 0 and 8 0x|2 31415 61718 Enter move, a number between 0 and 8 OX12 31415 61718 0XX 31415 61718 Enter move, a number between 0 and 8 OXX 31415 61718 Enter move, a number between 0 and 8 OX|X 01 415 61718 OX|X 01X5 61718 Enter move, a number between 0 and 8 0XX O|X5

Enter move, a number between 0 and 8 OXX 01415 61718 0XX 0x15 61718 Enter move, a number between 0 and 8 0XX 0x15 61718 5 Enter move, a number between 0 and 8 ox|x 0X10 61718 olxx 0X10 x|718 Player x wins the game. Enter S to stop game, any other letter to play ... Program finished with exit code o Press ENTER to exit console.]
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