chessBoard

#include <iostream>

int main()
{
    const int boardSize{ 8 };
    bool cellColor{ true }; // true - black, false - white
    int cellSize{ 2 };

    std::cout << "Enter cell size\n";
    std::cin >> cellSize;
    std::cout << '\n';
    for (int y{ 0 }, boardMax{ boardSize * cellSize }; y < boardMax; ++y)
    {
        for (int x{ 0 }; x < boardMax; ++x)
        {
            cellColor = (x / cellSize + y / cellSize) % 2;
            std::cout << (cellColor ? "  " : "##");
        }
        std::cout << '\n';
    }
}