C++ Choinka

#include <iostream>
#include <cstdio>
#include <conio.h>
using namespace std;

int main()

{
    do
   {
        int n;
    cout << "Ile wierszy? ";
    cin >> n;


    for (int i = 0; i < n ; i++)
    {

      for (int j = 0; j < 2 * i - j; j++)
        cout << ' ';

       for (int j = 0; j < 2 * n - 2 * i - 1 ; j++)
       cout << '*';
       cout << endl;
    }
   }
    while (getch());
    return 0;
}