//模板类，长方体类
template <typename ElementType>
class Rectangle
{///*重载基类的输入输出运算符*///template<typename ElementType>//friend std::istream& operator >> (std::istream& in, Rectangle<ElementType>& item);//template<typename ElementType>//friend std::ostream& operator << (std::ostream& out, const Rectangle<ElementType>& item);protected:        //受保护的成员ElementType length;        //长方体的长，在类内部可以直接使用模板定义的数据类型ElementType width;        //长方体的宽RectangleNo myNo;        //长方形的序号，嵌套类对象作为Rectangle类的一个数据成员

};

/*重载输入运算符*/
template <typename ElementType>
std::istream& operator >> (std::istream& in, Rectangle<ElementType>& item)
{in >> item.length >> item.width >> item.myNo.no;return in;
}/*重载输出运算符*/
template<typename ElementType>
std::ostream& operator << (std::ostream& out, const Rectangle<ElementType>& item)
{out << "length = " << item.length << " width = " << item.width << "    No = " << item.myNo.no;return out;
}

//模板类，长方体类
template <typename ElementType>
class Rectangle
{
public://读取长方形void read(std::istream& in);//输出长方形void display(std::ostream& out)const ;
protected:        //受保护的成员ElementType length;        //长方体的长，在类内部可以直接使用模板定义的数据类型ElementType width;        //长方体的宽RectangleNo myNo;        //长方形的序号，嵌套类对象作为Rectangle类的一个数据成员
};

template<typename ElementType>
void MyRectangle<ElementType>::read(std::istream& in)
{cout << "Please enter the length and width of " << myNo.no << endl;in >> length >> width;
}template<typename ElementType>
void MyRectangle<ElementType>::display(std::ostream& out) const
{out << "the " << myNo.no << " Rectangle's length =   " << length << " width = " << width;
}template<typename ElementType>
std::ostream& operator << (std::ostream& out, const Rectangle<ElementType>& item)
{item.display(out);return out;
}template<typename ElementType>
std::istream& operator >> (std::istream& in, Rectangle<ElementType>& item)
{item.read(in);return in;
}