broken tetris

#include <iostream>
#include <Windows.h>

using std::cout;
using std::cin;
using std::endl;


void main()
{
    // setlocale(LC_ALL, "Russian");


    int n = 0;

    while (1)
    {
        for (int i = 0; i < 10; i++)
        {

            for (int j = 0; j <= 10; j++)
            {
                (i == 9) ? cout << "_" : cout << " ";
                ((i == n) && (j == 4 || j == 5)) ? cout << "*" : cout << " ";
            }
            cout << endl;
        }

        Sleep(500);
        if (n + 1 < 10) n++;

        system("cls");

    }