hier mein code:

#ifndef kfzH
#define kfzH

#include <string>
using std::string;
//---------------------------------------------------------------------------
class KFZ
{
 protected:
 string marke;
 string model;
 int ps;
 string typ;
 static int printed;

 public:
 KFZ(){}
 KFZ(const string& Marke,const string& Model,int Ps);
 KFZ(const KFZ& op);
 virtual ~KFZ(){}

 string Hersteller();
 string Model();
 string Typ();
 int PS();
 virtual void Print()=0;
 static int Printed(int p=printed);

 KFZ& operator =(const KFZ& op);
 bool operator <(const KFZ& op);
};
//---------------------------------------------------------------------------
class PKW : public KFZ
{
 public:
 PKW(const string& Marke,const string& Model,int Ps);
 ~PKW(){}
 void Print();

};
//---------------------------------------------------------------------------
class LKW : public KFZ
{
 private:
 int nutzlast;

 public:
 LKW(const string& Marke,const string& Model,int Ps,int Nutzlast);
 LKW(const LKW& op);
 ~LKW(){}
 int Nutzlast();
 void Print();
 LKW& operator =(const LKW& op);
};
//---------------------------------------------------------------------------
#endif

und

//---------------------------------------------------------------------------

#pragma hdrstop

#include "kfz.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
// KFZ
KFZ::KFZ(const string& Marke,const string& Model,int Ps): marke(Marke),model(Model),ps(Ps){}
//---------------------------------------------------------------------------
string KFZ::Hersteller()
{

}
//---------------------------------------------------------------------------
string KFZ::Model()
{

}
//---------------------------------------------------------------------------
string KFZ::Typ()
{

}
//---------------------------------------------------------------------------
int KFZ::PS()
{

}
//---------------------------------------------------------------------------
int KFZ::Printed(int p)
{

}
//---------------------------------------------------------------------------
KFZ::KFZ(const KFZ& op)
{

}
//---------------------------------------------------------------------------
KFZ& KFZ::operator =(const KFZ& op)
{

}
//---------------------------------------------------------------------------
bool KFZ::operator <(const KFZ& op)
{

}
//---------------------------------------------------------------------------
//PKW
PKW::PKW(const string& Marke,const string& Model,int Ps): KFZ::marke(Marke),model(Model),ps(Ps)
{
 typ="PKW";
}
//---------------------------------------------------------------------------
void PKW::Print()
{

}
//---------------------------------------------------------------------------
//LKW
LKW::LKW(const string& Marke,const string& Model,int Ps,int Nutzlast): marke(Marke),model(Model),ps(Ps),nutzlast(Nutzlast)
{
 typ="LKW";
}
//---------------------------------------------------------------------------
int LKW::Nutzlast()
{

}
//---------------------------------------------------------------------------
void LKW::Print()
{

}
//---------------------------------------------------------------------------
LKW& LKW::operator =(const LKW& op)
{

}
//---------------------------------------------------------------------------
LKW::LKW(const LKW& op)
{

}
//---------------------------------------------------------------------------

Woran liegt das ?

danke schonmal
mfg walljumper