This is a Flutter tic tac toe game that prints and works in the console. It needs to work with the app's UI. The language is Dart. 1. Need to use these methods: a. void computerTurn(){} b. void displayBoard(){} c. int checkWinner(){return 0;} d. void showStatus() {} The console game uses a character array to represent the game board. The game will switch between the human and computer players. When the user presses a button, an "X" will display in it. When the computer chooses a button, an "O" will display. The computer tries to make a winning move, block the human from making a winning move, or make a random move. Here is the code for the console game: import 'package:flutter/material.dart'; import 'dart:math'; void main() { runApp(TTTApp()); } class TTTApp extends StatelessWidget { @override Widget build(BuildContext context) { return new MaterialApp( debugShowCheckedModeBanner: false, title: 'Tic Tac Toe', theme: new ThemeData( primarySwatch: Colors.blue, ), home: new MyHomePage(title: 'Tic Tac Toe'), ); } } class MyHomePage extends StatefulWidget { MyHomePage({Key key, this.title}) : super(key: key); final String title; @override _MyHomePageState createState() => _MyHomePageState(); } class _MyHomePageState extends State { String _mText = ""; // Initial Text for infoLabel String _text = "X's Turn"; // constant characters for each player static const String HUMAN_PLAYER = "X"; static const String COMPUTER_PLAYER = "O"; // constant for board size static const BOARD_SIZE = 9; // Game variables var gameOver = false; var win = 0; var turn = 0; var _mBoard = ["1", "2", "3", "4", "5", "6", "7", "8", "9"]; var rnd = new Random(BOARD_SIZE); // Print board to console void displayBoard() { print(_mBoard[0] + " | " + _mBoard[1] + " | " + _mBoard[2]); print("-----------"); print(_mBoard[3] + " | " + _mBoard[4] + " | " + _mBoard[5]); print("-----------"); print(_mBoard[6] + " | " + _mBoard[7] + " | " + _mBoard[8]); } // Check board for winner int checkWinner() { // Check horizontal wins for (int i = 0; i <= 6; i += 3) { if (_mBoard[i] == (HUMAN_PLAYER) && _mBoard[i + 1] == (HUMAN_PLAYER) && _mBoard[i + 2] == (HUMAN_PLAYER)) return 2; if (_mBoard[i] == (COMPUTER_PLAYER) && _mBoard[i + 1] == (COMPUTER_PLAYER) && _mBoard[i + 2] == (COMPUTER_PLAYER)) return 3; } // Check vertical wins for (int i = 0; i <= 2; i++) { if (_mBoard[i] == (HUMAN_PLAYER) && _mBoard[i + 3] == (HUMAN_PLAYER) && _mBoard[i + 6] == (HUMAN_PLAYER)) return 2; if (_mBoard[i] == (COMPUTER_PLAYER) && _mBoard[i + 3] == (COMPUTER_PLAYER) && _mBoard[i + 6] == (COMPUTER_PLAYER)) return 3; } // Check for diagonal wins if ((_mBoard[0] == (HUMAN_PLAYER) && _mBoard[4] == (HUMAN_PLAYER) && _mBoard[8] == (HUMAN_PLAYER)) || (_mBoard[2] == (HUMAN_PLAYER) && _mBoard[4] == (HUMAN_PLAYER) && _mBoard[6] == (HUMAN_PLAYER))) return 2; if ((_mBoard[0] == (COMPUTER_PLAYER) && _mBoard[4] == (COMPUTER_PLAYER) && _mBoard[8] == (COMPUTER_PLAYER)) || (_mBoard[2] == (COMPUTER_PLAYER) && _mBoard[4] == (COMPUTER_PLAYER) && _mBoard[6] == (COMPUTER_PLAYER))) return 3; for (int i = 0; i < BOARD_SIZE; i++) { // If we find a number, then no one has won yet if (!(_mBoard[i] == (HUMAN_PLAYER)) && !(_mBoard[i] == (COMPUTER_PLAYER))) return 0; } // If we make it through the previous loop, all places are taken, so it's a tie*/ return 1; } void computerTurn() { var move; displayMessage(COMPUTER_PLAYER + " MOVED, X's TURN"); // First see if there's a move O can make to win for (int i = 0; i < BOARD_SIZE; i++) { if (!(_mBoard[i] == (HUMAN_PLAYER)) && !(_mBoard[i] == (COMPUTER_PLAYER))) { String curr = _mBoard[i]; _mBoard[i] = COMPUTER_PLAYER; _mText = "O"; if (checkWinner() == 3) { return; } else _mBoard[i] = curr; } } // See if there's a move O can make to block X from winning for (int i = 0; i < BOARD_SIZE; i++) { if (!(_mBoard[i] == (HUMAN_PLAYER)) && !(_mBoard[i] == (COMPUTER_PLAYER))) { String curr = _mBoard[i]; // Save the current number _mBoard[i] = HUMAN_PLAYER; if (checkWinner() == 2) { _mBoard[i] = COMPUTER_PLAYER; return; } else _mBoard[i] = curr; } } // Generate random move var count = 0; do { count = count + 1; move = rnd.nextInt(9); print("Computer random move is " + '$move'); } while ( (_mBoard[move] == HUMAN_PLAYER || _mBoard[move] == COMPUTER_PLAYER) && (count < 9)); if ((_mBoard[move] == HUMAN_PLAYER) || (_mBoard[move] == COMPUTER_PLAYER)) { return; } else { print("Computer is making a random moving to " + '$move'); _mBoard[move] = COMPUTER_PLAYER; } } void displayMessage(String text) { setState(() { _text = text; print(_text); }); } void checkGameOver(int win) { if (win == 1) { gameOver = true; displayMessage("It's a tie."); } else if (win == 2) { gameOver = true; displayMessage(HUMAN_PLAYER + " wins!"); } else if (win == 3) { gameOver = true; displayMessage(COMPUTER_PLAYER + " wins!"); } } void _newGame() { setState(() { for (int i = 0; i < BOARD_SIZE; i++) _mBoard[i] = ""; win = 0; gameOver = false; turn = 0; _text = "X's Turn"; }); } //The buttons go from 0 - 8. Only showed the first so it wouldn't take up too much space. void _button0() { setState(() { // This call to setState tells the Flutter framework that something has // changed in this State, which causes it to rerun the build method below // so that the display can reflect the updated values. If we changed // _counter without calling setState(), then the build method would not be // called again, and so nothing would appear to happen. if (_mBoard[0] == HUMAN_PLAYER || _mBoard[0] == COMPUTER_PLAYER) { print("That space is occupied. Please choose another space."); return; } else if (win == 0) { if (turn == 0) { _mBoard[0] = HUMAN_PLAYER; _text = HUMAN_PLAYER + " MOVED, O's TURN"; print("onTap called. card #0 was pressed"); turn = 1; _mText = "X"; win = checkWinner(); checkGameOver(win); displayBoard(); } if ((turn == 1) && (win == 0)) { turn = 0; _mText = "O"; computerTurn(); win = checkWinner(); checkGameOver(win); displayBoard(); } } }); } @override Widget build(BuildContext context) { return new Scaffold( appBar: new AppBar( leading: new Icon(Icons.grid_on), title: new Text("Tic Tac Toe"), actions: [ new IconButton( icon: new Icon(Icons.new_releases), //add the new_releases/new game icon to the app bar onPressed: () { _newGame(); // debugPrint("New Game Tapped!"); }), body: new Container( padding: EdgeInsets.all(14.0), child: Column( mainAxisAlignment: MainAxisAlignment.start, children: [ Row( //Start of the 1st Row mainAxisAlignment: MainAxisAlignment.spaceEvenly, children: [ // Button 0 in 1st Row RaisedButton( padding: const EdgeInsets.all(20.0), onPressed: () { _button0(); }, child: new Text(" ", textAlign: TextAlign.center, style: new TextStyle( fontWeight: FontWeight.bold, fontSize: 40.0, fontFamily: 'Roboto', )), color: Colors.grey[300], ), //Button 1 in 1st Row RaisedButton( padding: const EdgeInsets.all(20.0), onPressed: () { _button1(); }, child: new Text(" ", textAlign: TextAlign.center, style: new TextStyle( fontWeight: FontWeight.bold, fontSize: 40.0, fontFamily: 'Roboto', ))), //Button 2 in 1st Row RaisedButton( padding: const EdgeInsets.all(20.0), onPressed: () { _button2(); }, child: new Text(" ", textAlign: TextAlign.center, style: new TextStyle( fontWeight: FontWeight.bold, fontSize: 40.0, fontFamily: 'Roboto', ))), ]), // end 1st Row Padding(padding: const EdgeInsets.all(7.0)), Row( //Start of the 2nd Row mainAxisAlignment: MainAxisAlignment.spaceEvenly, children: [ //Button 3 in 2nd Row RaisedButton( padding: const EdgeInsets.all(20.0), //color: Colors.grey[400], onPressed: () { _button3(); }, child: new Text(" ", textAlign: TextAlign.center, style: new TextStyle( fontWeight: FontWeight.bold, fontSize: 40.0, fontFamily: 'Roboto', ))), //Button 4 in 2nd Row RaisedButton( padding: const EdgeInsets.all(20.0), onPressed: () { _button4(); }, child: new Text(" ", textAlign: TextAlign.center, style: new TextStyle( fontWeight: FontWeight.bold, fontSize: 40.0, fontFamily: 'Roboto', ))), //Button 5 in 2nd Row RaisedButton( padding: const EdgeInsets.all(20.0), onPressed: () { _button5(); }, child: new Text(" ", textAlign: TextAlign.center, style: new TextStyle( fontWeight: FontWeight.bold, fontSize: 40.0, fontFamily: 'Roboto', ))), ]), //end 2nd Row Padding(padding: const EdgeInsets.all(7.0)), Row( //Start of the 3rd Row mainAxisAlignment: MainAxisAlignment.spaceEvenly, children: [ //Button 6 in 3rd Row RaisedButton( padding: const EdgeInsets.all(20.0), onPressed: () { _button6(); }, child: new Text(" ", textAlign: TextAlign.center, style: new TextStyle( fontWeight: FontWeight.bold, fontSize: 40.0, fontFamily: 'Roboto', ))), //Button 7 in 3rd Row RaisedButton( padding: const EdgeInsets.all(20.0), onPressed: () { _button7(); }, child: new Text(" ", textAlign: TextAlign.center, style: new TextStyle( fontWeight: FontWeight.bold, fontSize: 40.0, fontFamily: 'Roboto', ))), //Button 8 in 3rd Row RaisedButton( padding: const EdgeInsets.all(20.0), onPressed: () { _button8(); }, child: new Text(" ", textAlign: TextAlign.center, style: new TextStyle( fontWeight: FontWeight.bold, fontSize: 40.0, fontFamily: 'Roboto', ))), ]), // // end 3rd Row Padding(padding: const EdgeInsets.all(7.0)), Text( //Info Label _text, textAlign: TextAlign.center, overflow: TextOverflow.ellipsis, style: TextStyle(fontWeight: FontWeight.bold, fontSize: 25.0), ), Padding(padding: const EdgeInsets.all(35.0)), Row( //Start of the New Game button Row mainAxisAlignment: MainAxisAlignment.spaceEvenly, children: [ // New Game button new RaisedButton( padding: const EdgeInsets.fromLTRB(50.0, 40.0, 50.0, 40.0), color: Colors.grey[400], onPressed: () { _newGame(); }, child: new Text("New Game", textAlign: TextAlign.center, style: new TextStyle( color: Colors.black, fontWeight: FontWeight.bold, fontSize: 20.0, fontFamily: 'Roboto', ))), ]) ])), ); } }