main.cpp

#include <iostream>
#include "XOBoard.h"
int main()
{
	XOBoard Board{ 3 };
	Board.printBoard();
	//std::cout << Board ;
}



Cell.h

#pragma once

class Cell {
	private:
		char ch;
	public:
		Cell(char ch = '.');
		char getCellValue();
		void setCellValue(char nch);
};



Cell.cpp

#pragma once
#include "Cell.h"
#include <iostream>

Cell::Cell(char ch) {
	if (ch == 'X' || ch == 'O' || ch == '.') {
		this->ch = ch;
	}
	else {
		this->ch = '.';
	}
}
char Cell::getCellValue() {
	if (this->ch)
		return  this->ch;
	else
		return '0';
}
void Cell::setCellValue(char ch) {
	if (ch == 'X' || ch == 'O' || ch == '.') {
		this->ch = ch;
	}
	else {
		std::cout << "Error occurd!" << std::endl;
	}
}

XOBoard.h

#pragma once
#include "Cell.h"
#include <iostream>

class XOBoard {
	private:
		int n;
		Cell **Board;
	public:
		XOBoard(int n = 3);
		void printBoard();
		/*friend std::ostream& operator<<(std::ostream& output, const XOBoard& XOBoard) {
			for (int i = 0; i < XOBoard.n; i++) {
				for (int j = 0; j < XOBoard.n; j++) {
					output << XOBoard.Board[i][j].getCellValue();
				}
				output << std::endl;
			}
			return output;
		}*/
};


XOBoard.cpp

#pragma once
#include "Cell.h"
#include "XOBoard.h"
#include <iostream>

XOBoard::XOBoard(int n) {
	this->n = (n >= 3) ? n : 3;
	Cell** Board = new Cell*[n];
	for (int i = 0; i < n; i++) {
		Board[i] = new Cell[n];
	}
}

void XOBoard::printBoard() {
	for (int i = 0; i < n; i++) {
		for (int j = 0; j < n; j++) {
			std::cout << Board[i][j].getCellValue() << '|  ';
		}
		std::cout << std::endl;
	}
}