Zadanie pętle 11

#include <iostream>
using namespace std;
int main()
{
    int x,z;
    int i;

    cout << "Podaj dlugosc pierwszego boku:" << endl;
    cin >> x;
    z = x;
    x = 0;
    do
    {
        for (i = 0; i <= x; i++)
        {
            cout << "*";
        }
        x++;
        cout << "\n";
    } while (x != z);
}