hw09 code

string digit(int n, const string& symbols)
{
    string one = string(1, symbols[0]);
    string two = string(1, symbols[1]);
    string three = string(1, symbols[2]);

    switch (n)
    {
        case 1: return one; break;
        case 2: return one + one; break;
        case 3: return one + one + one; break;
        case 4: return one + two; break;
        case 5: return two; break;
        case 6: return two + one; break;
        case 7: return two + one + one; break;
        case 8: return two + one + one + one; break;
        case 9: return one + three; break;
        default: return "";
    }
}

    string toRoman(int n)
    {
        string roman;
        if (n <= 0 || n >= 4000)
        {
            return "OUT OF RANGE";
        }
        int digit = n / 1000;

        if (digit == 3)
            roman = "MMM";
        else if (digit == 2)
            roman = "MM";
        else if (digit == 1)
            roman = "M";

        n = n % 1000;
        digit = n / 100;
        roman += hundreds(digit);

        n = n % 100;
        digit = n / 10;
        roman += tens(digit);

        digit = n % 10;
        roman += ones(digit);

        return roman;
    }