java programmng TIC-TAC-TOE Your task is to develop a tic-tac-toe game. There are two options for you to choose from. One option is a tic-tac-toe…

java programmng

TIC-TAC-TOE

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Your task is to develop a tic-tac-toe game. There are two options for you to choose from. One option is a tic-tac-toe game where two humans may play. The second option is one where a human may play against the computer. Option one is worth less points (90% of total points) than option two (100% of total points).

PROGRAM REQUIREMENTS

The program prompts users for their names and ensures (validates) them; users are allowed to enter a single username consisting of alpha chars ONLY.

Use one-dimensional arrays to keep track of the game:

Human moves in the case of option one.

Computer moves as well in the case of option two.

Use functions to pass arrays and implement other program requirements such as input validation, checking to ensure that places selected by users are available on the “game board”.

Validate user input at every opportunity.

Do not allow number entries less than 0 or entries greater than 8 (in the case you are using numbers 0-8 on the “grid”.

Do not allow number entries less than 0 or entries greater than 8 (in the case you are using numbers 1-9 on the “grid”.

Do not allow non-numeric entries.

If your program crashes due to an invalid entry made by the user, then you will not pass the final exam.

The program must be developed using functions so that the main() function consists mostly of function calls. This is exactly the same requirement as your midterm!

Below is a suggested list of functions for you to consider in the development of this project:

splashScreen()//displays game and developer’s information

askForUserNames()//requests for username

validateUserName()//validate username

switchPlayer()//switch from one player to another

resetGame()//reset the game when one concludes; this includes filling the array with vales 0-8

displayGrid()//display the grid after each player makes a move

playerMakeMove()//prompts player to make a move, invokes validatePlayersMove, checkPositionAvailability

validatePlayersMove()//validates that user entry X is such that 0<=X<=8

checkPositionAvailability()//check that the position selected by the user is available

checkWin()//check for a winning player

checkTie()//check for a tie

In the case of option two, additional functions you may want to consider are:

makeBestMove()//select best option

computerMakeMove()//used to make the move, in other words populate the array

The main() function must use a loop to keep the user in the program until he/she wants to quit. Users should be allowed to play as many games as they want.

You must use meaningful variable names.

You must comment your code.

You must use variables of the correct type and initialize them with a proper value.

Your program must detect a winner if there is one

Your program must determine if a tie occurs

Expert Answer

 Here is the code for the game. Output is also shown. Please do rate the answer if it helped. Thank you very much.

import java.io.IOException;

import java.util.Random;

import java.util.Scanner;

public class TicTacToe {

private String username;

private Scanner input;

private char board[];

private Random random;

//constructor to initialize the scanner , board, random generator

public TicTacToe()

{

input = new Scanner(System.in);

board = new char[9];

random = new Random();

resetGame();

}

 

//displays the splash screen

public void splashScreen() throws IOException

{

System.out.println(“********************************”);

System.out.println(“********************************”);

System.out.println(“********************************”);

System.out.println(“********* **********”);

System.out.println(“********* TIC TAC TOE **********”);

System.out.println(“********* **********”);

System.out.println(“********* **********”);

System.out.println(“********************************”);

System.out.println(“********************************”);

System.out.println(“********************************”);

System.out.println(“nnPress any key to continue…”);

 

input.nextLine();

 

}

 

//ask for valid user name. Username should be a single word with only alphabet chars only. If invalid

//input is given, user is repeatedly prompted to give valid input

public void askForUserName()

{

System.out.println(“Player, enter your name”);

while(true)

{

System.out.println(“Enter a single word with alpha chars only!”);

username=input.nextLine();

if(!validateUserName())

{

System.out.println(“Invalid name”);

}

else

break;

}

}

 

//function to check if the instance variable username is a valid username or not. Returns true if valid and

//false otherwise

private boolean validateUserName()

{

char ch;

if(username == null || username.equals(“”)) //check if null or empty string

return false;

 

for(int i=0;i<username.length();i++)

{

ch = username.charAt(i);

if(!(ch>=’a’ && ch<=’z’ || ch>=’A’ && ch<=’Z’)) //only lower case and upper case chars allowed

return false;

}

 

return true;

}

 

 

//resets the game, board is initialized again from 0-8

public void resetGame()

{

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

board[i] = (char)(i + 48); //initialize using ascii value, numbers start from 48 for 0

}

 

//displays the board on screen after clearing the screen

public void displayGrid()

{

int idx;

try {

Runtime.getRuntime().exec(“clear”); //try clear command (works on linux based system)

} catch (IOException e) {

try {

Runtime.getRuntime().exec(“cls”); //if previous clear failed, try cls on windows system

} catch (IOException e1) {

 

}

}

 

System.out.println(” TIC-TAC-TOE”);

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

{

System.out.print(“n|———–|”);

System.out.print(“n| “);

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

{

idx = i * 3 + j;

System.out.print(board[idx]+” | “);

}

}

System.out.print(“n|———–|nn”);

}

 

//prompts the player for a move and validates his move i.e checks if input if in range 0-8.

//if valid , then checks if the specified position is available and not occupied yet.

//If available, then marks it with ‘H’ to indicate human move. Otherwise prompts user for

//a different position

public void playerMakeMove()

{

while(true)

{

System.out.println(“It is “+username+”‘s move”);

System.out.println(“Give me your best move!”);

int move=input.nextInt();

if(validatePlayerMove(move))

{

if(checkPositionAvailability(move))

{

board[move] = ‘H’; //make ‘H’ for player move

break;

}

else

{

System.out.println(“Position not available.nMake a different choice.”);

continue;

}

}

else

{

System.out.println(“Invalid entry!”);

continue;

}

}

}

 

//checks if user’s move is valid i.e in range 0-8

private boolean validatePlayerMove(int move)

{

if(move<0 || move >8)

return false;

else

return true;

}

//check if the specified

private boolean checkPositionAvailability(int move)

{

if(board[move]!=’C’ && board[move]!=’H’)

return true;

else

return false;

 

}

//checks if the board has a winner. Returns ‘H’ if human wins, ‘C’ if computer wins

//’ ‘ if nobody has won

public char checkWin()

{

if(board[0]==board[1] && board[1]==board[2]) //check top horizontal line

return board[0];

else if(board[3]==board[4] && board[4]==board[5]) //check middle horizontal line

return board[3];

else if(board[6]==board[7] && board[7]==board[8])//check last horizontal line

return board[6];

else if(board[0]==board[3] && board[3]==board[6])//check left vertical line

return board[0];

else if(board[1]==board[4] && board[4]==board[7])//check middle vertical line

return board[1];

else if(board[2]==board[5] && board[5]==board[8])//check right vertical line

return board[2];

else if(board[0]==board[4] && board[4]==board[8])//check diagonal line from left top to right bottom

return board[0];

else if(board[2]==board[4] && board[4]==board[6]) //check diagonal from right top to left bottom

return board[2];

else

return ‘ ‘;

}

 

//checks if there is tie. Returns true if tie and false otherwise

public boolean checkTie()

{

 

//first see if all the positions are occupied or not

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

{

if(board[i]!=’C’ && board[i]!=’H’)

return false;

}

//if all are occupied, now check winner, if ‘ ‘ is returned, then its a tie since already all positions are occupied

if(checkWin()==’ ‘)

return true;

else

return false;

 

}

 

//makes a computer’s move

public void computerMakeMove()

{

int move = makeBestMove();

board[move] = ‘C’;

}

 

//generates a random number in range 0-8 which is not yet occupied.

private int makeBestMove()

{

while(true)

{

int move = random.nextInt(9);

if(!checkPositionAvailability(move))

continue;

else

return move;

}

}

 

//returns the human player name

 

public String getUserName()

{

return username;

}

 

 

//prompts user if he wants to play again and returns true if user wants to continue and fals otherwise

public boolean playAgain()

{

System.out.println(“Game over! Play again ? y/n: “);

input.nextLine();//flush newline from previous input for positions

if(input.nextLine().trim().equalsIgnoreCase(“y”))

return true;

else

return false;

}

 

public static void main(String[] args) {

TicTacToe game=new TicTacToe();

char winner;

int turn=1;

try {

while(true) //keep repeating

{

game.splashScreen();

game.askForUserName();

while(true)

{

//check if already the game is over

winner = game.checkWin();

if(winner==’C’ || winner==’H’ || (winner == ‘ ‘ && game.checkTie()))

break;//break if game over

 

 

game.displayGrid();

if(turn == 1)

game.playerMakeMove();

else

game.computerMakeMove();

turn = 1 – turn;

}

 

//display game status

game.displayGrid();

if(winner == ‘C’)

System.out.println(“Computer wins!”);

else if(winner == ‘H’)

System.out.println(“Player “+game.getUserName()+” wins!”);

else

System.out.println(“It’s a tie!”);

 

//ask if user wants to continue

if(game.playAgain())

{

game.resetGame();

turn = 1;

}

else

{

System.out.println(“Thank you for playing TIC-TAC-TOE!”);

break;

}

 

}

} catch (IOException e) {

System.out.println(e.getMessage());

}

}

}

output

********************************

********************************

********************************

********* **********

********* TIC TAC TOE **********

********* **********

********* **********

********************************

********************************

********************************

Press any key to continue…

Player, enter your name

Enter a single word with alpha chars only!

human

TIC-TAC-TOE

|———–|

| 0 | 1 | 2 |

|———–|

| 3 | 4 | 5 |

|———–|

| 6 | 7 | 8 |

|———–|

It is human’s move

Give me your best move!

1

TIC-TAC-TOE

|———–|

| 0 | H | 2 |

|———–|

| 3 | 4 | 5 |

|———–|

| 6 | 7 | 8 |

|———–|

TIC-TAC-TOE

|———–|

| 0 | H | 2 |

|———–|

| 3 | 4 | C |

|———–|

| 6 | 7 | 8 |

|———–|

It is human’s move

Give me your best move!

2

TIC-TAC-TOE

|———–|

| 0 | H | H |

|———–|

| 3 | 4 | C |

|———–|

| 6 | 7 | 8 |

|———–|

TIC-TAC-TOE

|———–|

| 0 | H | H |

|———–|

| 3 | 4 | C |

|———–|

| C | 7 | 8 |

|———–|

It is human’s move

Give me your best move!

3

TIC-TAC-TOE

|———–|

| 0 | H | H |

|———–|

| H | 4 | C |

|———–|

| C | 7 | 8 |

|———–|

TIC-TAC-TOE

|———–|

| 0 | H | H |

|———–|

| H | C | C |

|———–|

| C | 7 | 8 |

|———–|

It is human’s move

Give me your best move!

3

Position not available.

Make a different choice.

It is human’s move

Give me your best move!

7

TIC-TAC-TOE

|———–|

| 0 | H | H |

|———–|

| H | C | C |

|———–|

| C | H | 8 |

|———–|

TIC-TAC-TOE

|———–|

| 0 | H | H |

|———–|

| H | C | C |

|———–|

| C | H | C |

|———–|

It is human’s move

Give me your best move!

0

TIC-TAC-TOE

|———–|

| H | H | H |

|———–|

| H | C | C |

|———–|

| C | H | C |

|———–|

Player human wins!

Game over! Play again ? y/n:

y

********************************

********************************

********************************

********* **********

********* TIC TAC TOE **********

********* **********

********* **********

********************************

********************************

********************************

Press any key to continue…

Player, enter your name

Enter a single word with alpha chars only!

alice

TIC-TAC-TOE

|———–|

| 0 | 1 | 2 |

|———–|

| 3 | 4 | 5 |

|———–|

| 6 | 7 | 8 |

|———–|

It is alice’s move

Give me your best move!

1

TIC-TAC-TOE

|———–|

| 0 | H | 2 |

|———–|

| 3 | 4 | 5 |

|———–|

| 6 | 7 | 8 |

|———–|

TIC-TAC-TOE

|———–|

| 0 | H | 2 |

|———–|

| 3 | C | 5 |

|———–|

| 6 | 7 | 8 |

|———–|

It is alice’s move

Give me your best move!

5

TIC-TAC-TOE

|———–|

| 0 | H | 2 |

|———–|

| 3 | C | H |

|———–|

| 6 | 7 | 8 |

|———–|

TIC-TAC-TOE

|———–|

| 0 | H | 2 |

|———–|

| C | C | H |

|———–|

| 6 | 7 | 8 |

|———–|

It is alice’s move

Give me your best move!

2

TIC-TAC-TOE

|———–|

| 0 | H | H |

|———–|

| C | C | H |

|———–|

| 6 | 7 | 8 |

|———–|

TIC-TAC-TOE

|———–|

| C | H | H |

|———–|

| C | C | H |

|———–|

| 6 | 7 | 8 |

|———–|

It is alice’s move

Give me your best move!

8

TIC-TAC-TOE

|———–|

| C | H | H |

|———–|

| C | C | H |

|———–|

| 6 | 7 | H |

|———–|

Player alice wins!

Game over! Play again ? y/n:

n

 

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