Объекты и классы в С++

class computer
{
     int frequency;
 public:
     
computer(): frequency(0) {}  // Конструктор
computer(int value): frequency(value) {} // Конструктор
 
int getFrequency() // Получаем значение frequency
{
     return frequency;
}
 
void setFrequency (int new_value) // Даем новое значение для frequency
{
    frequency = new_value;
}
 
};

class Computer
{
public:
   Computer() : frequency( default_frequency ) {}
   Computer( int frequency ) : frequency( frequency ) {}
   Computer( const Computer &other ) : frequency( other.frequency ) {}
   ~Computer() {}
   Computer & operator =( const Computer &other )
   {
      frequency = other.frequency;
      return ( *this );
   }
   int get_frequency() const { return ( frequency ); }
   void set_frequency( int frequency ) { this->frequency = frequency; }
   std::ostream & out( std::ostream &os ) const
   {
      return ( os << frequency );
   }
   static const int default_frequency = 200;
private:
   int frequency;
};
   
 
std::ostream & operator <<( std::ostream &os, const Computer &rhs )
{
   return ( rhs.out( os ) );
}
 
bool operator ==( const Computer &lhs, const Computer &rhs )
{
   return ( lhs.get_frequency() == rhs.get_frequency() );
}