#include <iostream>
#include <string>

enum class CardMark {
    spade,
    club,
    diamond,
    heart,
};

std::string get_mark_string(CardMark card_mark)
{
    // switch文の caseラベルに使える
    switch (card_mark) {
    case CardMark::spade:
        return "spade";
    case CardMark::club:
        return "club";
    case CardMark::diamond:
        return "diamond";
    case CardMark::heart:
        return "heart";
    default:
        return "";
    }
}

int main()
{
    CardMark mark {CardMark::spade};  // 変数の宣言と初期化
    mark = CardMark::diamond;         // 代入
    std::cout << std::boolalpha << (mark == CardMark::diamond) << "\n";  // 比較

    std::cout << get_mark_string(mark) << "\n";
}