BR012debugBasics

#include <iostream>
#include <chrono>
#include <thread>

int main()
{

    int side{5};
    //std::cout << "enter line length\n";
    //std::cin >> side;
    char symb = '#';

    for (int y{ 0 }; y < side; ++y)
    {
        for (int x{ 0 }; x < side; ++x)
        {
            symb = ' ';

            if (x + y == (side - 1) and (x == y))
            {
                symb = '*';
            }

            std::cout << ' ' << symb << ' ';

        }
        std::cout << '\n';
    }

    return 0;
}
//std::this_thread::sleep_for(std::chrono::milliseconds(200)); //make some pause for better output look :)