#include <cassert> enum Youbi { Getsu, Ka, Sui, Moku, Kin, Do, Nichi }; enum DayOfWeek { Sun, Mon, Tue, Wed, Thu, Fri, Sat }; class Dual { public: Dual() : value_(Getsu) {} explicit Dual(Youbi value) : value_(value) {} explicit Dual(DayOfWeek value</cassert>…