向上转型机制中基类的getType成员没有输出结果

//Furniture.h

#include <iostream>
#include <string>
using namespace std;

class Furniture           //家具类
{
private:
    string type;      //家具类型
    string mat;     //家具主材料
    double price;     //家具价格
public:
    Furniture(string type,string mat,double price):mat(mat),price(price){}
    string getMaterial()
    {
        return mat;
    }
    double getprice()
    {
        return price;
    }
    string getType()
    {
        return type;
    }
};


class Sofa:public Furniture    //沙发类
{
private:
    int seats;
public:
    Sofa(string mat,double price,int seats):Furniture("沙发",mat,price),seats(seats){}
    int getseats()
    {
        return seats;
    }
};


class Bed:public Furniture   //床 类
{
private:
    string bedtype;
public:
    Bed(string mat,double price,string bedtype):Furniture("床",mat,price),bedtype(bedtype){}
    string getBedType()
    {
        return bedtype;
    }
};
void show(Furniture *f)
{
    cout<<"家具类型："<<f->getType()<<"   主材料："<<f->getMaterial()<<"   价格："<<f->getprice()<<endl;
}
int _tmain(int argc, _TCHAR* argv[])
{
    cout<<"向上转型机制示例："<<endl;
    Sofa sofa1("木材",870.00,3);
    Bed bed1("木材",1280.00,"双人");
    Furniture *sofa2=new Sofa("钢材",410.00,1);      //用派生类指针初始化基类指针
    Furniture &bed2=*new Bed("竹子",1280.00,"单人");     //用派生类对象初始化基类的引用
    Furniture bed3=bed1;       //派生类对象赋值给基类对象
    show(&sofa1);
    show(sofa2);
    show(&bed3);
    show(&bed2);
    delete sofa2;    //释放动态空间
    delete &bed2;    //释放动态空间
    return 0;
}