Method setGender

week09/examples/firstclass.cpp:28–31

            std::cerr << "The input b is " << b << ", and should be in [1990, 2020]." << std::endl;
    }
    void setGender(bool isMale)
    {
        male = isMale;
    }
    void printInfo()
    {
        std::cout << "Name: " << name << std::endl;