Need help with Class code.

[johnnyo]

I am writing a code that converts a non-negative number into a vector of binary numbers.
Example: 19 should become 10011 that is stored in a vector<bool>.
I am stuck because I don't even know what goes into the default constructor in the first place.

#include <iostream>
#include <vector>

class Integer
{
public:
Integer();
Integer(unsigned int a);

void print_as_int() const;
void print_as_bits() const;

private:
std::vector<bool> bit;
};

Integer::Integer()
{
bit[0] = 0;
}

Integer::Integer(unsigned int a) //you convert into bit here
{

if (a == 0) bit.push_back(0);

while (a > 0)
{
bit.push_back(a % 2);
a /= 2;
}
}

void Integer::print_as_bits() const
{

std::cout << "(";
for (int i = 0; i > bit.size(); i++)
{
std::cout << bit[i];
}
std::cout << ")_2";
}

int main()
{
unsigned int uint_value;

std::cout << "Please input an integer a: ";
std::cin >> uint_value;
Integer a = uint_value;

std::cout << "The base-2 representation of a is: ";
a.print_as_bits();
std::cout << std::endl;

return 0;
}

[gunnerfunner]

Item 18, Effective STL (Scott Meyers): Avoid using vector<bool>

#include <iostream>
#include <string>
#include <deque>
#include <limits>

using numType = unsigned long long;
struct NumberToBinary
{
    numType m_num;
    std::deque<bool> m_binary_rep;

    NumberToBinary(const numType& num) : m_num(num)
    {
        const numType base = 2;
        std::string s;
        s.reserve( std::numeric_limits<numType>::digits );
        do { s.push_back( m_num % base + '0' ); } while ( m_num /= base );
        for (auto& elem : s)
        {
            elem == '1' ? m_binary_rep.push_front(true): m_binary_rep.push_front(false);
        }
    }
};
int main()
{
    NumberToBinary x(19);
    for (auto& elem : x.m_binary_rep)
    {
        std::cout << elem << " ";
    }
}

edit: add some input validation for negative numbers, etc of course

[shadder]

or use bitset operators