#include?
#include?
#include?

using?namespace?std;

class?Coin
{
public:
???/**
??????Constructs?a?coin?with?a?given?name?and?value
??????@param?n?the?coin?name
??????@param?v?the?coin?value
???*/
???Coin（string?n?double?v）;
???/**
??????Gets?the?coin?name.
??????@return?the?name
???*/
???string?get_name（）?const;
???/**
??????Gets?the?coin?value
??????@return?the?value
???*/
???double?get_value（）?const;
private:
???string?name;
???double?value;
};

Coin::Coin（string?n?double?v）
{
???name?=?n;
???value?=?v;
}

string?Coin::get_name（）?const
{
???return?name;
}

double?Coin::get_value（）?const
{
???return?value;
}

class?Product
{
public:
???/**
??????Constructs?a?product?with?a?given?name?price?and?quantity
?????