建立普通的基类Building,用来存储一座楼房的层数、房间数以及它的总平方米数。建立派生类House，继承Building,并存储下面的内容:卧室与浴室的数量。另外，建立派生类Office,继承Bu

class Builing { private: int cengshu;//层数 int fangjianshu;//房间数 double total_area;//总平方米 public: //构造函数 Builing(int ceng = 0, int fangjian = 0, double area =0.0) :cengshu(ceng), fangjianshu(fangjian), total_area(area) { //检验合法性 if (cengshu < 0) { cengshu = 0; } if (fangjianshu < 0) { fangjianshu = 0; } if (total_area < 0) { total_area = 0; } } //获得属性 int getcengshu()const { return cengshu; } int getfangjianshu()const { return fangjianshu; } double gettotal_area()const { return total_area; } //设置属性 int setcengshu(int ceng) { if (cengshu >= 0) { cengshu = ceng; } } int setfangjianshu(int fangjian) { if (fangjianshu >=0 ) { fangjianshu = fangjian; } } int settotal_area(double area) { if (total_area >=0) { total_area = area; } } //显示信息 virtual void show()const { cout << "楼房信息 " << endl; cout << "层数" << cengshu << endl; cout << "房间数量" << fangjianshu << endl; cout << "总平方米" << total_area << "平方米" << endl; } }; class House :public Builing { private: int bedroom_count;//卧室数量 int bathroom_count;//浴室数量 public: //构造函数 House(int ceng = 0, int fangjian = 0, double area = 0.0, int bedroom = 0, int bathroom = 0) : Builing(ceng, fangjian, area), bedroom_count(bedroom), bathroom_count(bathroom) { //检验合理性 if (bedroom_count < 0) { bedroom_count = 0; } if (bathroom_count < 0) { bathroom_count = 0; } } //显示信息 void show()const { //因为show是虚函数 Builing::show(); cout << "住宅信息" << endl; cout << "卧室数量" << bedroom_count << endl; cout << "浴室数量" << bathroom_count << endl; } }; class Office :public Builing { private: int fire_extinguisher;//灭火器数量 int phone_count;//电话数量 public: Office(int ceng = 0, int fangjian = 0, double area = 0.0, int fire = 0, int phone = 0) : Builing(ceng, fangjian, area), fire_extinguisher(fire), phone_count(phone) { if (fire_extinguisher < 0) { fire_extinguisher = 0; } if (phone_count < 0) { phone_count = 0; } } //显示信息 void show()const { Builing::show(); cout << "办公室信息" << endl; cout << "灭火器数量" << fire_extinguisher << endl; cout << "电话数量" << phone_count << endl; } }; int main() { Builing* b1 = nullptr, * b2 = nullptr; House house(3, 8, 120, 2, 4); b1 = &house; Office office(3, 8, 120, 8, 4); b2 = &office; b1->show(); cout << endl; b2->show(); return 0; }