#include<iostream.h>
class evhicle //定義基類evhicle
{
     int wheels;
     double weight;
public:    
    evhicle(int wl,double wt)
    {
        wheels=wl;
        weight=wt;
    }
void show();
};
class car:private evhicle  //定義派生類car
{
    int passenger_load;
public:
    car(int wl,double wt,int pd):evhicle(wl,wt)
    {
        passenger_load=pd;
    }
    void show();
};
class truck:private evhicle  //定義派生類truck
{
    int passenger_load;
 public:
    truck(int wl,double wt,int pd,double pl):evhicle(wl,wt)
    {
        passenger_load=pd;payload=pl;
    }
void show();
};
void evhicle::show()
    {
        cout<<"wheels="<<wheels<<" 個"<<'\t'<<"weight="<<weight<<" 噸"<<'\t';
    }
void car::show()
    {
        cout<<"car:"<<'\t';
        evhicle::show();
        cout<<"passenger_load="<<passenger_load<<" 人"<<endl;
    }
void truck::show()
    {   
        cout<<"truck:"<<'\t';
        evhicle::show();
        cout<<"passenger_load="<<passenger_load<<" 人"<<'\t'<<"payload="<<payload<<" 噸"<<endl;
    }
void main()
{
    
    car car1(4,2,6);
    truck truck1(10,5,3,100);
    cout<<"輸出結果為："<<endl;
    car1.show();
    truck1.show();
}



類truck里面少定義了一個屬性  payloda ;