#include <iostream>
#include <iomanip>
#include <algorithm>

using namespace std;

class Product_Line
{
public:
  Product_Line(string const& pn, int cnt, double pr)
    : product_name{pn}, count{cnt}, price{pr} {}
  
  void print(ostream& os) const
  {
      os << product_name << ": "
         << count << "st * "
         << price << "kr";
  }

  operator double() const { return count*price; }
  
private:
  string product_name;
  int count;
  double price;
};

class Receipt
{
public:
  Receipt(int n) : number{n}, reg{} {}

  void add_transaction(string const& name, int count, double price)
  {
    reg.emplace_back(name, count, price);
  }
  void print_receipt()
  {
    cout << "Receipt no " << number << ": " << endl;
    for ( auto t : reg )
    {
      t.print(cout);
      cout << endl;
    }
    
    cout << "===" << endl
         << "Köpeskilling: " << purchase_value() << "kr" << endl;
  }
  double purchase_value()
  {
    double purchase_value{0.0};
    for ( Product_Line const& t : reg )
    {
      purchase_value += t;
    }    
    return purchase_value;
//    return accumulate(reg.cbegin(), reg.cend(), double{});
  }
  
private:
  int number;
  vector<Product_Line> reg;
};

int main()
{
  cout << setprecision(2) << fixed;
  {
    Receipt r{1};
    r.add_transaction("apelsin", 2, 5.0);
    r.add_transaction("banan", 5, 7.5);
    r.add_transaction("citron", 1, 15.0);
    r.print_receipt();
  }
  cout << endl;
  {
    Receipt r{2};
    r.add_transaction("gurka", 1, 9.0);
    r.add_transaction("tomat", 5, 18.5);
    r.add_transaction("sallad", 1, 11.0);
    r.print_receipt();
  }
  cout << endl;
  {
    Receipt r{3};
    r.add_transaction("smör", 1, 19.0);
    r.add_transaction("bröd", 10, 24.5);
    r.add_transaction("ost", 1, 48.0);
    r.print_receipt();
  }
  return 0;
}