#include <iostream>
#include <string>

using namespace std;

string dec_to_bin(const int number)
{
    if (number == 0 || number == 1)
    {
        return number == 0 ? "0" : "1";
    }

    return number % 2 == 0 ? dec_to_bin(number / 2) + "0" : dec_to_bin(number / 2) + "1";
}

string complete(string binary)
{
    while (binary.length() < 8)
    {
        binary.insert(0, "0");
    }

    return binary;
}

int bin_to_dec(string binary)
{
    const int length = binary.length();
    auto sum = 0;
    auto power = 1;

    for (auto i = length - 1; i >= 0; i--)
    {
        sum += (binary[i] - 48)*power;
        power *= 2;
    }

    return sum;
}

int main()
{
    int number;
    cout << "Wprowadz liczbe dziesietna:" << endl;
    cin >> number;

    if (cin.fail() || number < 0) {
        cout << "Podales zla liczbe" << endl;
        return 0;
    }

    cout << "Ta liczba binarnie to: " << endl;
    string binary = complete(dec_to_bin(number));
    cout << binary << endl;

    cout << "Ta liczba decymalnie to:" << endl;
    cout << bin_to_dec(binary);
    return 0;
}