Классы (исправить ошибки)

#include <iostream.h>
#include <string.h>
 
class LightDevice
 
{
public: 
   LightDevice(int,int,int );
 
   void show_LightDevice(void);
 
   int GetLight()
{
    return Light;
}
 
int GetPower()
{
    return Power;
}
 
int GetVoltage()
{
    return Voltage;
}
 
private:
    
int Light;
 
int Power;
 
int Voltage;
 
};
 
LightDevice::LightDevice(int Light, int Power,int Voltage)
 
{ 
   LightDevice::Light = Light;
   LightDevice::Power = Power;
   LightDevice::Voltage = Voltage;
}
 
void LightDevice::show_LightDevice(void)
 
{ 
  cout << "Yarkost: " << Light << endl;
  cout << "Moshnoct: " << Power << endl;
  cout << "Napryagenie: " << Voltage << endl;
}
 
class Lamp : public LightDevice
 
{ 
private:
 
   int State;
   int Color;
   
public: 
 
   Lamp(int, int, int,int );
 
   void show_Lamp(void);
 
   int Off(void)
   {
   State=0;
   return State;
   };
 
  int On(void)
   {
   State=1;
   return State;
 
   };
 
  Lamp operator++(int); 
   
};
 
Lamp Lamp::operator++(int)
{
 
Lamp old=*this;
 
Light++;
 
cout << "rezultat peregruzki: " << Light << endl;
 
return old;
 
}
 
Lamp::Lamp(int Light, int Power, int Voltage, int Color) : LightDevice(Light, Power, Voltage)
 
{ 
    Lamp::Color = Color; 
}
 
void Lamp::show_Lamp(void)
 
{ 
   show_LightDevice(); 
   cout << "Cvet: " << Color << endl;
   cout << "Sostoyanie: " << State << endl;
}
 
void main(void)
 
{ 
   LightDevice sost(8, 4, 2);
   Lamp cvet(15, 3, 12, 6);
   sost.show_LightDevice();
   cvet.show_Lamp(); 
}