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

std::string writeanumber(int);
std::string ten_teen(int);
std::string multiple_ten(int);

int main()
{
    try
    {
        int number(0);
        int count(0);
        std::string tens;
        std::string singles;
        std::string teens;
        const int end(999);

        std::cout << "Input a number between -100 and 100: \n";
        std::cin >>  number;
        if (not std::cin.good())
        {
            std::cout << "You must input a interger!\n";
            throw std::exception();
        }
        if (number > 100 && number != end)
        {
            std::cout << "Out of range number!\n";
            throw std::exception();
        }

        if (number < 0)
        {
            std::cout << "minus ";
            for (int i=number; i != 0; ++i)
            {
                ++count;
            }
            number = count;
        }
        if ( number < 10)
        {
            singles = writeanumber(number);
            std::cout << singles << '\n';
        }

        if (number >= 10 or number <= 19)
        {
            teens = ten_teen(number);
            std::cout << teens << '\n';
        }

        if (number >= 20)
        {
            if (number < 100)
            {
                int remainder = number % 10;
                number -= remainder;
                tens = multiple_ten(number);
                singles = writeanumber(remainder);
                std::cout << tens << " " << singles << '\n';
            }

        }
    }

}

catch (...)
{
    std::cerr << "***An exception was thrown***\n";
}
}

std::string writeanumber(int num)
{
    std::string value;
    switch (num)
    {
    case 1:
        value = "one";
        break;

    case 2:
        value = "two";
        break;
    case 3:
        value = "three";
        break;

    case 4:
        value = "four";
        break;


    case 5:
        value = "five";
        break;

    case 6:
        value = "six";
        break;

    case 7:
        value = "seven";
        break;

    case 8:
        value = "eight";
        break;

    case 9:
        value = "nine";
        break;
    }
    return value;
}

std::string ten_teen(int num)
{
    std::string value;

    switch (num)
    {
    case 10:
        value = "ten";
        break;

    case 11:
        value = "eleven";
        break;

    case 12:
        value = "twelve";
        break;

    case 13:
        value = "thirteen";
        break;

    case 14:
        value = "fourteen";
        break;

    case 15:
        value = "fifteen";
        break;

    case 16:
        value = "sixteen";
        break;

    case 17:
        value = "seventeen";
        break;

    case 18:
        value = "eighteen";
        break;

    case 19:
        value = "nineteen";
        break;
    }
    return value;
}

std::string multiple_ten(int num)
{
    std::string value;
    switch (num)
    {
    case 20:
        value = "twenty";
        break;

    case 30:
        value = "thirty";
        break;

    case 40:
        value = "forty";
        break;

    case 50:
        value = "fifty";
        break;

    case 60:
        value = "sixty";
        break;

    case 70:
        value = "seventy";
        break;

    case 80:
        value = "eighty";
        break;

    case 90:
        value = "ninety";
        break;
    }
    return value;
}