Почему не работают примеры для enum class?

using namespace System;
 
enum class Suit{Clubs, Diamonds, Hearts, Spades};
 
int main(array<System::String ^> ^args)
{
    Suit suit = Suit::Clubs;
    int value = safe_cast<int>(suit);
    Console::WriteLine(L"Suit is {0} and the value is {1}", suit, value);
    return 0;
}
 
// This example will produce the following output:
// Suit is Clubs and the value is 0

using namespace System;
 
enum class Colors
{
   Red, Green, Blue, Yellow
};
 
int main()
{
   Console::WriteLine("The 4th value of the Colors Enum is {0}", Enum::GetName(Colors::typeid, 3));
 
   return 0;
}
 
// The example displays the following output:
//       The 4th value of the Colors Enum is Yellow

using namespace System;
 
enum class Suit{Clubs, Diamonds, Hearts, Spades};
 
const char* SuitToString(Suit s) throw()
{
    switch (s)
    {
        case Suit::Clubs: return "Clubs";
        case Suit::Diamonds: return "Diamonds";
        case Suit::Hearts: return "Hearts";
        case Suit::Spades: return "Spades";
    }
}
 
int main(array<System::String ^> ^args)
{
    Suit suit = Suit::Clubs;
    int value = safe_cast<int>(suit);
    Console::WriteLine(L"Suit is {0} and the value is {1}", gcnew String(SuitToString(suit)), value);
 
    Suit suit = Suit::Diamonds;
    int value = safe_cast<int>(suit);
    Console::WriteLine(L"Suit is {0} and the value is {1}", gcnew String(SuitToString(suit)), value);
 
    return 0;
}