Convert a method from C# to C++ Winforms

Question

Hi friends,

I'm making a program that converts decimal numbers into Roman numerals and vice versa. I'm having trouble converting roman to number. I found a method on the internet in C#, but it uses a Dictionary and I've never used it. I would like to convert the method below to C++ Winforms.

Tks

Answer 1

I found it too. A possible conversion:

static ref class Roman
{
    static initonly Dictionary<wchar_t, int>^ RomanNumberDictionary;

    static Roman( )
    {
        RomanNumberDictionary = gcnew Dictionary<wchar_t, int>;
        RomanNumberDictionary['I'] = 1;
        RomanNumberDictionary['V'] = 5;
        RomanNumberDictionary['X'] = 10;
        RomanNumberDictionary['L'] = 50;
        RomanNumberDictionary['C'] = 100;
        RomanNumberDictionary['D'] = 500;
        RomanNumberDictionary['M'] = 1000;
    }


public:
    static int From( String^ roman )
    {
        int total = 0;

        int current, previous = 0;
        wchar_t currentRoman, previousRoman = L'\0';

        for( int i = 0; i < roman->Length; i++ )
        {
            currentRoman = roman[i];

            previous = previousRoman != L'\0' ? RomanNumberDictionary[previousRoman] : L'\0';
            current = RomanNumberDictionary[currentRoman];

            if( previous != 0 && current > previous )
            {
                total = total - ( 2 * previous ) + current;
            }
            else
            {
                total += current;
            }

            previousRoman = currentRoman;
        }

        return total;
    }
};

// Example:
// Console::WriteLine( Roman::From( "MMXXIII" ) );

Answer 2

Hi Viorel.

It worked perfect.

Thanks a lot for the help.

The program turned out really nice.

José Carlos - Brazil