Accessing a reference array with multiple arguments? - c++

Question

This is a simple tic-tac-toe game as I'm sure you've seen, the code is incomplete. I don't need somebody to look over all of it, just how to format the 2-D character array before '.empty' so that I know how to access it as a reference. If you can take a look at inside the "int get_row()", that'd be great.
I've already tried everything that my textbook and C++ tutorials tell me, and I"m pretty sure none of them have 2-D arrays as part of the exercises. I mean, I can't find it, if you can send a link that'd be nice.
#include <iostream>
#include <string>
#include <array>
using namespace std;
char board[3][3];
void print_board(char board[3][3])
{
cout << " 0 1 2 " << endl;
cout << "0 " << board[0][0] << " | " << board[0][1] << " | " << board[0][2] << " " << endl;
cout << " -----------" << endl;
cout << "1 " << board[1][0] << " | " << board[1][1] << " | " << board[1][2] << " " << endl;
cout << " -----------" << endl;
cout << "2 " << board[2][0] << " | " << board[2][1] << " | " << board[2][2] << " " << endl;
}
void clear_board(char board[][3])
{
}
int get_row(char board[][3], char player)
{
int row;
cout << "Please enter the row move for player " << player << endl;
cin >> row;
if (board.empty())
return row;
}
int get_column(char board[][3], char player)
{
int column;
cout << "Please enter the column move for player " << player << endl;
cin >> column;
return column;
}
bool check_win(char board[][3], char player)
{
return true;
}
bool board_full(char board[][3])
{
return true;
}
bool square_occupied(char board[][3],int row,int column)
{
return true;
}
void get_move(char board[3][3], char player)
{
do
{
do {
int row, column;
get_row(board, player);
get_column(board, player);
square_occupied(board, row, column);
} while (square_occupied);
board_full(board);
} while (!board_full);
}
int main()
{
string play_again = "Y", answer;
int row, column;
char player = 'X';
cout << "Welcome to tic-tac-toe!" << endl;
cout << "Please, use the coordinates for rows and columns to record moves." << endl;
do {
do {
print_board(board);
board_full(board);
get_move(board, player);
check_win(board, player);
if (player == 'X')
{
player = 'O';
}
else
{
player = 'X';
}
} while (!check_win);
cout << "Would you like to play again? (Y/N)";
cin >> answer;
}while (answer == play_again);
return 0;
}
I just want to be able to check if the array container at [row] is going to be empty or not. I really just can't use reference arrays, that's all.

Answer 1

If you declare a C-array, it's never empty (and also it doesnt have aempty` member function).
char board[3][3]; //Never empty - always has 9 values
Of course, a Tic Tac Toe board can be empty. The array representing the board isn't empty, but the values in the array are probably set to either 0 or some other value that indicates that they're empty.
We can write a small class to represent the board, and give it a empty function:
struct Board {
char board[3][3];
Board() : board() {}
bool empty() const {
char* data = &board[0][0];
for(int i = 0; i < 9; i++) {
if(data[i] != 0) return false;
}
return true;
}
bool rowEmpty(int row) const {
return board[row][0] == 0 && board[row][1] == 0 && board[row][2] == 0;
}
bool colEmpty(int col) const {
return board[0][col] == 0 && board[1][col] == 0 && board[2][col] == 0;
}
void putX(int row, int col) {
board[row][col] = 'X';
}
void putO(int row, int col) {
board[row][col] = 'O';
}
// This function returns a reference so you can modify it if you want
char& getSquare(int row, int col) {
return board[row][col];
}
};
By creating a class to represent the board, you can add whatever functionality and member functions you want!