Can someone help me get this Java tic-tac-toe program to where it\'s human vs. c

ID: 3794723 • Letter: C

Question

Can someone help me get this Java tic-tac-toe program to where it's human vs. computer, randomly selects 'x' or 'o' for the user to use, randomly decides on who will go first, and does not terminate the program whenever there is an error? Thanks, and below is my current program.

//tic-tac-toe program

import java.util.Scanner;

public class LeavinesTicTacToe
{
public static Scanner sc = new Scanner(System.in);

public static void main(String[] args)
{

final int SIZE = 3;
char[][] board = new char[SIZE][SIZE]; // game board

resetBoard(board); // initialize the board (with ' ' for all cells)

// First, welcome message and display the board.
System.out.println("===== WELCOME TO THE TIC-TAC-TOE GAME!! ===== ");
showBoard(board);

// Then ask the user which symbol (x or o) he/she wants to play.
System.out.print(" Which symbol do you want to play, "x" or "o"? ");
char userSymbol = sc.next().toLowerCase().charAt(0);
char compSymbol = (userSymbol == 'x') ? 'o' : 'x';

// Also ask whether or not the user wants to go first.
System.out.println();
System.out.print(" Do you want to go first (y/n)? ");
char ans = sc.next().toLowerCase().charAt(0);

int turn; // 0 -- the user, 1 -- the computer
int remainCount = SIZE * SIZE; // empty cell count

// THE VERY FIRST MOVE.
if (ans == 'y') {
turn = 0;
userPlay(board, userSymbol); // user puts his/her first tic
}
else {
turn = 1;
compPlay(board, compSymbol); // computer puts its first tic
}
// Show the board, and decrement the count of remaining cells.
showBoard(board);
remainCount--;

// Play the game until either one wins.
boolean done = false;
int winner = -1; // 0 -- the user, 1 -- the computer, -1 -- draw

while (!done && remainCount > 0) {
// If there is a winner at this time, set the winner and the done flag to true.
done = isGameWon(board, turn, userSymbol, compSymbol); // Did the turn won?

if (done)
winner = turn; // the one who made the last move won the game
else {
// No winner yet. Find the next turn and play.
turn = (turn + 1 ) % 2;

if (turn == 0)
userPlay(board, userSymbol);
else
compPlay(board, compSymbol);

// Show the board after one tic, and decrement the rem count.
showBoard(board);
remainCount--;
}
}

// Winner is found. Declare the winner.
if (winner == 0)
System.out.println(" ** YOU WON. CONGRATULATIONS!! **");
else if (winner == 1)
System.out.println(" ** YOU LOST.. Maybe next time :) **");
else
System.out.println(" ** DRAW... **");

}

public static void resetBoard(char[][] brd)
{
for (int i = 0; i < brd.length; i++)
for (int j = 0; j < brd[0].length; j++)
brd[i][j] = ' ';
}

public static void showBoard(char[][] brd)
{
int numRow = brd.length;
int numCol = brd[0].length;

System.out.println();

// First write the column header
System.out.print(" ");
for (int i = 0; i < numCol; i++)
System.out.print(i + " ");
System.out.print(' ');

System.out.println(); // blank line after the header

// The write the table
for (int i = 0; i < numRow; i++) {
System.out.print(i + " ");
for (int j = 0; j < numCol; j++) {
if (j != 0)
System.out.print("|");
System.out.print(" " + brd[i][j] + " ");
}

System.out.println();

if (i != (numRow - 1)) {
// separator line
System.out.print(" ");
for (int j = 0; j < numCol; j++) {
if (j != 0)
System.out.print("+");
System.out.print("---");
}
System.out.println();
}
}
System.out.println();
}

public static void userPlay(char[][] brd, char usym)
{
System.out.print(" Enter the row and column indices: ");
int rowIndex = sc.nextInt();
int colIndex = sc.nextInt();

while (brd[rowIndex][colIndex] != ' ') {
System.out.print(" !! The cell is already taken. Enter the row and column indices: ");
rowIndex = sc.nextInt();
colIndex = sc.nextInt();
}

brd[rowIndex][colIndex] = usym;
}

public static void compPlay(char[][] brd, char csym)
{
// Find the first empty cell and put a tic there.
for (int i = 0; i < brd.length; i++) {
for (int j = 0; j < brd[0].length; j++) {
if (brd[i][j] == ' ') { // empty cell
brd[i][j] = csym;
return;
}
}
}
}

public static boolean isGameWon(char[][] brd, int turn, char usym, char csym)
{
char sym;
if (turn == 0)
sym = usym;
else
sym = csym;

int i, j;
boolean win = false;

// Check win by a row
for (i = 0; i < brd.length && !win; i++) {
for (j = 0; j < brd[0].length; j++) {
if (brd[i][j] != sym)
break;
}
if (j == brd[0].length)
win = true;
}

// Check win by a column
for (j = 0; j < brd[0].length && !win; j++) {
for (i = 0; i < brd.length; i++) {
if (brd[i][j] != sym)
break;
}
if (i == brd.length)
win = true;
}

// Check win by a diagonal (1)
if (!win) {
for (i = 0; i < brd.length; i++) {
if (brd[i][i] != sym)
break;
}
if (i == brd.length)
win = true;
}

// Check win by a diagonal (2)
if (!win) {
for (i = 0; i < brd.length; i++) {
if (brd[i][brd.length - 1 - i] != sym)
break;
}
if (i == brd.length)
win = true;
}

// Finally return win
return win;
}
}

Explanation / Answer

your program is absolutly correct only we need to handle the exceptions we can always face exceprtion when it comes to array if the user input larger number it will be and exception i just handled all by using try catch exception handling .please check your code with try catch

import java.util.Scanner;
public class LeavinesTicTacToe
{
public static Scanner sc = new Scanner(System.in);
public static void main(String[] args)
{
final int SIZE = 3;
char[][] board = new char[SIZE][SIZE]; // game board
resetBoard(board); // initialize the board (with ' ' for all cells)
// First, welcome message and display the board.
System.out.println("===== WELCOME TO THE TIC-TAC-TOE GAME!! ===== ");
showBoard(board);
// Then ask the user which symbol (x or o) he/she wants to play.
System.out.print(" Which symbol do you want to play, "x" or "o"? ");
char userSymbol = sc.next().toLowerCase().charAt(0);
char compSymbol = (userSymbol == 'x') ? 'o' : 'x';
// Also ask whether or not the user wants to go first.
System.out.println();
System.out.print(" Do you want to go first (y/n)? ");
char ans = sc.next().toLowerCase().charAt(0);
int turn; // 0 -- the user, 1 -- the computer
int remainCount = SIZE * SIZE; // empty cell count
// THE VERY FIRST MOVE.
if (ans == 'y') {
turn = 0;
try {
userPlay(board, userSymbol); // user puts his/her first tic
}
catch (Exception e){
   System.out.println("please enter valid rows and column indices");
}
}
else {
turn = 1;
compPlay(board, compSymbol); // computer puts its first tic
}
// Show the board, and decrement the count of remaining cells.
showBoard(board);
remainCount--;
// Play the game until either one wins.
boolean done = false;
int winner = -1; // 0 -- the user, 1 -- the computer, -1 -- draw
while (!done && remainCount > 0) {
// If there is a winner at this time, set the winner and the done flag to true.
done = isGameWon(board, turn, userSymbol, compSymbol); // Did the turn won?
if (done)
winner = turn; // the one who made the last move won the game
else {
// No winner yet. Find the next turn and play.
turn = (turn + 1 ) % 2;
if (turn == 0)
try {userPlay(board, userSymbol);
}
catch (Exception e){
   System.out.println("please enter valid rows and column indices ");
}

else
compPlay(board, compSymbol);
// Show the board after one tic, and decrement the rem count.
showBoard(board);
remainCount--;
}
}
// Winner is found. Declare the winner.
if (winner == 0)
System.out.println(" ** YOU WON. CONGRATULATIONS!! **");
else if (winner == 1)
System.out.println(" ** YOU LOST.. Maybe next time :) **");
else
System.out.println(" ** DRAW... **");
}
public static void resetBoard(char[][] brd)
{
for (int i = 0; i < brd.length; i++)
for (int j = 0; j < brd[0].length; j++)
brd[i][j] = ' ';
}
public static void showBoard(char[][] brd)
{
int numRow = brd.length;
int numCol = brd[0].length;
System.out.println();
// First write the column header
System.out.print(" ");
for (int i = 0; i < numCol; i++)
System.out.print(i + " ");
System.out.print(' ');
System.out.println(); // blank line after the header
// The write the table
for (int i = 0; i < numRow; i++) {
System.out.print(i + " ");
for (int j = 0; j < numCol; j++) {
if (j != 0)
System.out.print("|");
System.out.print(" " + brd[i][j] + " ");
}
System.out.println();
if (i != (numRow - 1)) {
// separator line
System.out.print(" ");
for (int j = 0; j < numCol; j++) {
if (j != 0)
System.out.print("+");
System.out.print("---");
}
System.out.println();
}
}
System.out.println();
}
public static void userPlay(char[][] brd, char usym)
{
System.out.print(" Enter the row and column indices: ");
int rowIndex = sc.nextInt();
int colIndex = sc.nextInt();
while (brd[rowIndex][colIndex] != ' ') {
System.out.print(" !! The cell is already taken. Enter the row and column indices: ");
rowIndex = sc.nextInt();
colIndex = sc.nextInt();
}
try {
   brd[rowIndex][colIndex] = usym;
}
catch(Exception e) {
   System.out.println("please enter correct row and column number ");
}

}
public static void compPlay(char[][] brd, char csym)
{
// Find the first empty cell and put a tic there.
for (int i = 0; i < brd.length; i++) {
for (int j = 0; j < brd[0].length; j++) {
if (brd[i][j] == ' ') { // empty cell
brd[i][j] = csym;
return;
}
}
}
}
public static boolean isGameWon(char[][] brd, int turn, char usym, char csym)
{
char sym;
if (turn == 0)
sym = usym;
else
sym = csym;
int i, j;
boolean win = false;
// Check win by a row
for (i = 0; i < brd.length && !win; i++) {
for (j = 0; j < brd[0].length; j++) {
if (brd[i][j] != sym)
break;
}
if (j == brd[0].length)
win = true;
}
// Check win by a column
for (j = 0; j < brd[0].length && !win; j++) {
for (i = 0; i < brd.length; i++) {
if (brd[i][j] != sym)
break;
}
if (i == brd.length)
win = true;
}
// Check win by a diagonal (1)
if (!win) {
for (i = 0; i < brd.length; i++) {
if (brd[i][i] != sym)
break;
}
if (i == brd.length)
win = true;
}
// Check win by a diagonal (2)
if (!win) {
for (i = 0; i < brd.length; i++) {
if (brd[i][brd.length - 1 - i] != sym)
break;
}
if (i == brd.length)
win = true;
}
// Finally return win
return win;
}
}

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