Decimal to Binary

decimaltobinary.cpp

#include <iostream>
#include <vector>
#include <string>
#include <limits>
#include <stdexcept>

int main()
{
    std::string input;
    unsigned long long num;
    int remainder { 0 };
    std::vector<int> binary;

    std::cout << "Positive Number to Binary Converter\n";
    std::cout << "Enter a number: ";

    while (true)
    {
        std::cin >> input;

        if (input.find_first_not_of("0123456789") != std::string::npos)
        {
            std::cout << "Invalid input. Please enter a valid number: ";
            continue;
        }

        try
        {
            num = std::stoull(input);
            break;
        }
        catch (const std::out_of_range&)
        {
            std::cout << "Number out of range for a 64-bit unsigned integer. Please enter a valid number: ";
        }
        catch (const std::invalid_argument&)
        {
            std::cout << "Invalid input. Please enter a valid number: ";
        }
    }

    std::cout << std::endl;

    if (num == 0)
    {
        std::cout << "The binary representation is 0";
    }
    else
    {
        binary.clear();
        while (num > 0)
        {
            remainder = num % 2;
            num = num / 2;
            binary.push_back(remainder);
        }

        std::cout << "The binary representation is: ";
        for (int i = binary.size() - 1; i >= 0; i--)
        {
            std::cout << binary[i];
        }
        std::cout << std::endl;
    }

    return 0;
}