#include <string>
#include <deque>
class StockMarket;

class Stock
{
public:
  Stock( const string&, double price );
  const string& symbol() const { return symbol_; }
  void setPrice( double );
  double price() const;
  void printHistory() const;
  double gain( unsigned int ) const;

private:
  string symbol_;
  deque<double> history_;
  static const unsigned int historySize;
};