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private string _readyToCalc = ;
private string _output = ;

private string _readyToCalc2 = ;
private string _output2 = ;

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 private void BtnName0_Click(object sender, RoutedEventArgs e)
{
      AddNumber(0);
      TbInput.Text = _readyToCalc;
}

private void AddNumber(int num)
{
      _readyToCalc += num.ToString();
}

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        private void BtnCalc_Click(object sender, RoutedEventArgs e)
        {
            try
            {
                int number = int.Parse(_readyToCalc);

                _output = IntToRoman(number);
                LvOutput.Items?.Add(_output);
            }
            catch (Exception)
            {
                // ignored
            }
            _readyToCalc = ;
            TbInput.Text = ;
        }

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        private void BtnClear_Click(object sender, RoutedEventArgs e)
        {
            _readyToCalc = ;
            TbInput.Text = ;
        }

        private void BtnClearRecord_Click(object sender, RoutedEventArgs e)
        {
            LvOutput.Items?.Clear();
        }

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        private void BtnNameI_Click(object sender, RoutedEventArgs e)
        {
            AddRoman(I);
            TbInput2.Text = _readyToCalc2;
        }

        private void AddRoman(string roman)
        {
            _readyToCalc2 += roman;
        }

        private void BtnCalc2_Click(object sender, RoutedEventArgs e)
        {
            try
            {
                _output2 = RomanToInt(_readyToCalc2).ToString();
                LvOutput2.Items?.Add(_output2);
            }
            catch (Exception)
            {
                // ignored
            }
            _readyToCalc2 = ;
            TbInput2.Text = ;
        }

        private void BtnClear2_Click(object sender, RoutedEventArgs e)
        {
            _readyToCalc2 = ;
            TbInput2.Text = ;
        }

        private void BtnClearRecord2_Click(object sender, RoutedEventArgs e)
        {
            LvOutput2.Items?.Clear();
        }

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private void LvOutput_DoubleTapped(object sender, DoubleTappedRoutedEventArgs e)
{
    DataPackage dp = new DataPackage();
    if (LvOutput.SelectedItem != null)
    {
        dp.SetText(LvOutput.SelectedItem.ToString());
        Clipboard.SetContent(dp);
    }
}

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    public enum Roman
    {
        M = 1000,
        CM = 900,
        D = 500,
        CD = 400,
        C = 100,
        XC = 90,
        L = 50,
        XL = 40,
        X = 10,
        IX = 9,
        V = 5,
        IV = 4,
        I = 1
    };
public int RomanToInt(string s)
{
    int result = 0;
    Type R = typeof(Roman);
    string first, second;
    if (s.Length > 1)
    {
        first = s.Substring(0, 1); second = s.Substring(0, 2);
    }
    else
    {
        first = s.Substring(0, 1); second = ;
    }
    foreach (var r in Enum.GetNames(R).Reverse())
    {
        while ((r.Length == 1 && first == r) || (r.Length == 2 && second == r))
        {
            result += int.Parse(Enum.Format(R, Enum.Parse(R, r), d));
            int lenR = r.Length, lenS = s.Length;
            if (lenS - lenR < 1)
                s = ;
            else
                s = s.Substring(lenR, lenS - lenR);

            if (s.Length > 1)
            {
                first = s.Substring(0, 1); second = s.Substring(0, 2);
            }
            else if (s.Length == 1)
            {
                first = s.Substring(0, 1); second = ;
            }
            else
            {
                first = ; second = ;
            }
        }
    }
    return result;
}

public string IntToRoman(int num)
{
    string result = ;
    Type R = typeof(Roman);

    foreach (var r in Enum.GetNames(R).Reverse())
    {
        while (num >= int.Parse(Enum.Format(R, Enum.Parse(R, r), d)))
        {
            result += r.ToString();
            num -= int.Parse(Enum.Format(R, Enum.Parse(R, r), d));
        }
    }
    return result;
}

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