#define CSHARP2 using System; #pragma warning disable 1030 // Disable user-defined warnings // The TicTacToe class enables two players to // play tic-tac-toe. class TicTacToeGame // Declares the TicTacToeGame class { static void Main() // Declares the entry point to the program { // Stores locations each player has moved. int[] playerPositions = { 0, 0 }; // Initially set the currentPlayer to Player 1; int currentPlayer = 1; // Winning player int winner = 0; string input = null; // Display the board and // prompt the current player // for their next move. for (int turn = 1; turn <= 10; ++turn) { DisplayBoard(playerPositions); #region Check for End Game if (EndGame(winner, turn, input)) { break; } #endregion Check for End Game input = NextMove(playerPositions, currentPlayer); winner = DetermineWinner(playerPositions); // Switch players currentPlayer = (currentPlayer == 2) ? 1 : 2; } } private static string NextMove(int[] playerPositions, int currentPlayer) { string input; // Repeatedly prompt the player for a move // until a valid move is entered. bool validMove; do { // Request a move from the current player. System.Console.Write("\nPlayer {0} - Enter move:", currentPlayer); input = System.Console.ReadLine(); validMove = ValidateAndMove(playerPositions, currentPlayer, input); } while (!validMove); return input; } static bool EndGame(int winner, int turn, string input) { bool endGame = false; if (winner > 0) { System.Console.WriteLine("\nPlayer {0} has won!!!!", winner); endGame = true; } else if (turn == 10) { // After completing the 10th display of the // board, exit out rather than prompting the // user again. System.Console.WriteLine("\nThe game was a tie!"); endGame = true; } else if (input == "" || input == "quit") { // Check if user quit by hitting Enter without // any characters or by typing "quit". System.Console.WriteLine("The last player quit"); endGame = true; } return endGame; } static int DetermineWinner(int[] playerPositions) { int winner = 0; // Determine if there is a winner int[] winningMasks = { 7, 56, 448, 73, 146, 292, 84, 273}; foreach (int mask in winningMasks) { if ((mask & playerPositions[0]) == mask) { winner = 1; break; } else if ((mask & playerPositions[1]) == mask) { winner = 2; break; } } return winner; } static bool ValidateAndMove( int[] playerPositions, int currentPlayer, string input) { bool valid = false; // Check the current player's input. switch (input) { case "1": case "2": case "3": case "4": case "5": case "6": case "7": case "8": case "9": #warning "Same move allowed multiple times." int shifter; // The number of places to shift // over in order to set a bit. int position; // The bit which is to be set. // int.Parse() converts "input" to an integer. // "int.Parse(input) - 1" because arrays // are zero based. shifter = int.Parse(input) - 1; // Shift mask of 00000000000000000000000000000001 // over by cellLocations. position = 1 << shifter; // Take the current player cells and OR them to set // the new position as well. // Since currentPlayer is either 1 or 2 you // subtract one to use currentPlayer as an // index in a 0-based array. playerPositions[currentPlayer - 1] |= position; valid = true; break; case "": case "quit": valid = true; break; default: // If none of the other case statements // is encountered, then the text is invalid. System.Console.WriteLine( "\nERROR: Enter a value from 1-9. " + "Push ENTER to quit"); break; } return valid; } static void DisplayBoard(int[] playerPositions) { // This represents the borders between each cell // for one row. string[] borders = { "|", "|", "\n---+---+---\n", "|", "|", "\n---+---+---\n", "|", "|", "" }; // Display the current board; int border = 0; // set the first border (border[0] = "|") #if CSHARP2 System.Console.Clear(); #endif for (int position = 1; position <= 256; position <<= 1, border++) { char token = CalculateToken( playerPositions, position); // Write out a cell value and the border that // comes after it. System.Console.Write(" {0} {1}", token, borders[border]); } } static char CalculateToken( int[] playerPositions, int position) { // Initialize the players to 'X' and 'O' char[] players = {'X', 'O'}; char token; // If player has the position set, // then set the token to that player. if ((position & playerPositions[0]) == position) { // Player 1 has that position marked token = players[0]; } else if ((position & playerPositions[1]) == position) { // Player 2 has that position marked token = players[1]; } else { // The position is empty. token = ' '; } return token; } #line 113 "TicTacToe.cs" // Generated code goes here #line default }
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