Dec to [2-36]-th base

#include <iostream>
#include <string>
#include <vector>

using namespace std;

int main(int argc, char *argv[])
{
    if (argc < 3)
    {
        cout << "Uzycie:   " << argv[0] << " <liczba DEC> <baza>" << endl;
        cout << "Przyklad: " << argv[0] << " 254 16" << endl;

        return 0;
    }

    if (atoi(argv[2]) < 2 or atoi(argv[2]) > 36)
    {
        cout << "Baza musi byc miedzy 2 a 36!" << endl;

        return 0;
    }

    vector<char> cyfry;
    int baza = atoi(argv[2]);

    cout << "cyfry systemu " << argv[2] << ":" << endl;

    for (int i = 0; i < baza; i++)
    {
        if (i < 10)
        {
            cyfry.push_back((char)('0' + i));
        }
        else
        {
            cyfry.push_back((char)('A' + i - 10));
        }

        cout << cyfry[i] << " ";
    }

    cout << endl << endl;

    int liczba = atoi(argv[1]);
    string hex = "";
    int temp = liczba;
    vector<int> div;
    int i = 0;

    while (temp > 0)
    {
        div.push_back(temp % baza);

        temp -= div[i];
        temp /= baza;

        i++;
    }

    for (int i = div.size() - 1; i >= 0; i--)
    {
        hex += cyfry[div[i]];
    }

    cout << liczba << "{10} = " << hex << "{" << baza << "}" << endl;
}