Наследование, базовые классы и производные классы

#include <iostream>
#include <conio.h>
 
using namespace std;
 
class transport
{
    int weight;
    int power;
    int speed;
public:
    transport (int,int,int);
    virtual void display();
};
 
class countries
{
    char* country;
public:
    countries (char*);
    virtual void display();
};
 
class car:public transport,public countries
{
    char* carname;
public:
    car(int, int, int , char*, char*);
    void display();
};
 
class sportcar:public car
{
    char* carsport;
public:
    sportcar(int, int, int , char*, char*,char*);
    void display();
};
 
class truck:public car
{
    char* cartruck;
public:
    truck(int, int, int , char*, char*,char*);
    void display();
};
 
transport::transport(int transport_weight,int transport_power,int transport_speed)
   :weight (transport_weight), power (transport_power), speed (transport_speed)
{}
 
countries::countries(char* countries_country)
   :country (countries_country)
{}
 
car::car(int transport_weight,int transport_power,int transport_speed,char* countries_country,char* car_carname)
   :transport(transport_weight,transport_power,transport_speed), countries(countries_country),carname (car_carname)
{}
 
sportcar::sportcar(int transport_weight,int transport_power,int transport_speed,char* countries_country,char* car_carname,char* sportcar_carsport)
   :transport(transport_weight,transport_power,transport_speed), countries(countries_country),car (car_carname),carsport (sportcar_carsport)
{}   // ошибка 2664, ошибка 2614(два раза)
 
truck::truck(int transport_weight,int transport_power,int transport_speed,char* countries_country,char* car_carname,char* truck_cartruck)
   :transport(transport_weight,transport_power,transport_speed), countries(countries_country),car (car_carname),cartruck (truck_cartruck)
{}  // ошибка 2664, ошибка 2614(три раза)
 
void transport::display()
{
    cout<<weight<<endl<<power<<endl<<speed<<endl;
}
 
void countries::display()
{
    cout<<country<<endl;
}
 
void car::display()
{
    transport::display();
    countries::display();
    cout<<"Name of the car: "<<carname<<endl;
}
 
void sportcar::display()
{
    car::display();
    cout<<carsport<<endl;
}
 
void truck::display()
{
    car::display();
    cout<<cartruck<<endl;
}
 
void main()
{
    //transport* x= new transport(1200,300,180),t*;
    //countries* y=new countries("America");
    //car* z= new car(
    sportcar* s=new sportcar(1200,300,180,"USA","Ford Mustang '69","Sportcar");
    truck* t=new truck(2000,150,160,"USSR","Gazelle","Truck");
    s->display();
    cout<<"________________________"<<endl;
    t->display();
getch();
}