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tarasjg/Exercise08_09.java

Last active March 25, 2016 02:53
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tic tac toe
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Exercise08_09.java
import java.util.Scanner;
public class Exercise08_09 {
public static void main(String[] args) {
Scanner stdin = new Scanner(System.in);
int[][] board = {{-1, -1, -1},
{-1, -1, -1},
{-1, -1, -1}};
int turn = 1;
int player;
while (winner(board) == 3) {
printBoard(initializeBoard(board));
if (turn % 2 == 1) player = 0;
else player = 1;
int row;
int column;
do {
row = getRow(stdin, player);
column = getColumn(stdin, player);
} while(!isValid(row, column, board));
updateBoard(board, row, column, player);
turn++;
}
printBoard(initializeBoard(board));
if (winner(board) == 0) System.out.println("O wins!");
else if (winner(board) == 1) System.out.println("X wins!");
else if (winner(board) == -1) System.out.println("Draw!");
}
//returns board as string
public static String initializeBoard(int[][] board) {
String bar = "-------------";
String xBlock = "| X ";
String oBlock = "| O ";
String bBlock = "| ";
String master = "";
for (int i = 0; i < 3; i++) {
master += bar + "\n";
for (int j = 0; j < 3; j++) {
if (board[i][j] == -1) master += bBlock;
else if (board[i][j] == 0) master += oBlock;
else master += xBlock;
}
master += "|\n";
}
master += bar;
return master;
}
//prints board
public static void printBoard(String board) {
System.out.println(board);
}
//get row from user
public static int getRow(Scanner stdin, int player) {
String sPlayer;
if (player == 0) sPlayer = "O";
else sPlayer = "X";
System.out.print("Enter a row, player " + sPlayer + " -> ");
int row = stdin.nextInt();
return row;
}
//get column from user
public static int getColumn(Scanner stdin, int player) {
String sPlayer;
if (player == 0) sPlayer = "O";
else sPlayer = "X";
System.out.print("Enter a column, player " + sPlayer + " -> ");
int column = stdin.nextInt();
return column;
}
//validates row/column
public static boolean isValid(int row, int column, int[][] board) {
if ((row > 2 || row < 0) || (column > 2 || column < 0)) {
return false;
} else if (board[row][column] == 0 || board[row][column] == 1) {
return false;
} else {
return true;
}
}
//updates board
public static void updateBoard(int[][] board, int row, int column, int player) {
board[row][column] = player;
}
//checks for a winner or a tie
public static int winner(int[][] board) {
if ((board[0][0] == 0 && board[0][1] == 0 && board[0][2] == 0) ||
(board[1][0] == 0 && board[1][1] == 0 && board[1][2] == 0) ||
(board[2][0] == 0 && board[2][1] == 0 && board[2][2] == 0) ||
(board[0][0] == 0 && board[1][0] == 0 && board[2][0] == 0) ||
(board[0][1] == 0 && board[1][1] == 0 && board[2][1] == 0) ||
(board[0][2] == 0 && board[1][2] == 0 && board[2][2] == 0) ||
(board[0][0] == 0 && board[1][1] == 0 && board[2][2] == 0) ||
(board[2][0] == 0 && board[1][1] == 0 && board[0][2] == 0)) {
return 0; // O wins
} else if ((board[0][0] == 1 && board[0][1] == 1 && board[0][2] == 1) ||
(board[1][0] == 1 && board[1][1] == 1 && board[1][2] == 1) ||
(board[2][0] == 1 && board[2][1] == 1 && board[2][2] == 1) ||
(board[0][0] == 1 && board[1][0] == 1 && board[2][0] == 1) ||
(board[0][1] == 1 && board[1][1] == 1 && board[2][1] == 1) ||
(board[0][2] == 1 && board[1][2] == 1 && board[2][2] == 1) ||
(board[0][0] == 1 && board[1][1] == 1 && board[2][2] == 1) ||
(board[2][0] == 1 && board[1][1] == 1 && board[0][2] == 1)) {
return 1; // X wins
}
for (int i = 0; i < 3; i++) {
for (int j = 0; j < 3; j++) {
if (board[i][j] == -1) {
return 3; //continue
}
}
}
return -1; // tie
}
}
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