Классы. Не понимаю условие

#include  <iostream.h>
#include  <conio.h>
#include  <string.h>
//>>>>>>>>>>>>>>>>>>>Class Operation Sistem
class OS {
protected:
  unsigned int RAM;
  char nameOS[80];
 
  unsigned HAM;
  char *resourses;
 
  unsigned nR;
 
public:
  OS() {
    cout << "Enter OS name: ";
    cin >> nameOS;
    cout << "Separate RAM for OS: ";
    cin >> RAM;
    cout << "Separate HDD for OS: ";
    cin >> HAM;
    nR=-1;
  }
 
  OS(char *inameOS, int iRAM, int iHAM) {
    RAM=iRAM;
    HAM=iHAM;
    strcpy(nameOS,inameOS);
  }
 
  virtual ~OS() {}
  getRAM() { return RAM; }
  getHAM() { return HAM; }
 
};
 
//>>>>>>>>>>>>>>>>>>>>>>>Class Driver
class Driver {
protected:
  char nameD[80];
  char ability[80];
  unsigned RAMD;
  unsigned HAMD;
public:
  Driver(){
    cout << "Enter driver name: ";
    cin >> nameD;
    cout << "Set driver ability: ";
    cin >> ability;
    cout << "RAM nided for driver: ";
    cin >> RAMD;
    cout << "Hard space nided for driver: ";
    cin >> HAMD;
  }
 
  Driver(char *inameD,char *ch, int iRAMD, int iHAMD) {
    RAMD=iRAMD;
    HAMD=iHAMD;
    strcpy(ability,ch);
    strcpy(nameD,inameD);
    }
  virtual ~Driver() {}
 
  getRAMD() { return RAMD; }
  getHAMD() { return HAMD; }
 
 
};
 
//>>>>>>>>>>>>>>>>>>>>>>>>>>>Dother of OS and Driver classes - class WorkSpase
 
class WorkSpace : public OS, public Driver {
  unsigned RAMS,HAMS;
 
  public:
    int exfl();
    WorkSpace() {
     strcpy(resourses,ability);
     }
 
    WorkSpace(char *inameOS, int iRAM, int iHAM, char *inameD, char *ch, int iRAMD, int iHAMD) : OS(inameOS,iRAM,iHAM),
 
    Driver(inameD,ch,iRAMD,iHAMD)    {
     strcpy(resourses,ability);
     }
 
    friend ostream &operator<<(ostream &stream, WorkSpace obj);
 
};
 
 
//..........................Messege Function @Outof memory@
int WorkSpace::exfl() {
      if( (RAM<=RAMD)||(HAM<=HAMD) )
        {
        cout << "Memory is foll. Cant instal a driver.\n";
        return 1;
        }
      else return 0;
      }
//..........................Overloaded operator
 
ostream &operator << (ostream &stream, WorkSpace obj) {
  if (obj.exfl()==1) {
    stream<<"Out of memory.\n\n";
    return stream;
    }
  stream<<"OS name: "<<obj.nameOS<<"\n";
  stream<<"OS RAM : "<<obj.RAM<<"\n";
  stream<<"OS HDD : "<<obj.HAM<<"\n";
  stream<<"Driver name       : "<<obj.nameD<<"\n";
  stream<<"Driver ability    : "<<obj.resourses<<"\n";
  stream<<"Driver needed RAM : "<<obj.RAMD<<"\n";
  stream<<"Driver needed HDD : "<<obj.HAMD<<"\n";
  stream<<"Work Space RAM: "<<obj.RAM-obj.RAMD<<"\n";
  stream<<"Work Space HDD: "<<obj.HAM-obj.HAMD<<"\n\n";
  return stream;
  }
 
 
//^^^^^^^^^^^^^^^^^^^^^^^^^^MAIN PART
 
main()
{
clrscr();
WorkSpace A,B("MacOS", 512, 2000, "OpenGL", "GoodenWorkWithVideo", 16, 54);
 
cout<<A;
cout<<B;
  getch();
  return 0;
}