有一个交通工具类vehicle。将它为 基类派生的有派生小车类car，卡车类truck和轮船类boat。定义这些类，并使其可以显示其各类交通工具的具体信息。

他们包括的信息，有例如以下几种：

1.名字    -----与输入的名字相符合

2.时速(km/h)    -----最高时速

3.耗油量(L/100km)    -----在经济时速下測得耗油量

小车类：
250km/h
14.8 L/100km
卡车类：
140km/h
18L/100km
轮船类：
50km/h
8.33L/100km

输入三个派生类相应名字。

输出相应类型的信息。

Mercedes_Benz
Transport_truck
Boat

Mercedes_Benz
250km/h
14.8L/100km
Transport_truck
140km/h
18L/100km
Boat
50km/h
8.33L/100km

#include <iostream> 
#include <string>
using namespace std; 

class Vehicle 

{ 
	
public:
	
    string name ;  
	 
	
public: 
    Vehicle (string h): name(h){} 
	virtual void showinfo () const
	{
		cout<<name<<endl; 
		
	}
}; 

class Car :virtual public Vehicle    

{ 
	public: 
	double Speed;   
	
    double fuel ;  
	
public:   
    Car (string h): Vehicle (h),Speed(250),fuel(14.8){} 
	virtual void showinfo () const
	{
		cout<<name<<endl; 
        cout<<Speed<<"km/h"<<endl; 
        cout<<fuel<<"L/100km"<<endl; 
	}
	
	
};
class Truck :virtual public Vehicle   

{ 
	
public:
	
  
	
    double Speed;   
	
    double fuel ;  
	
public:   
    Truck (string h): Vehicle (h),Speed(140),fuel(18){} 
	virtual void showinfo () const
	{
		cout<<name<<endl; 
        cout<<Speed<<"km/h"<<endl; 
        cout<<fuel<<"L/100km"<<endl; 
	}
	
	
};
class Boat :virtual public Vehicle    

{ 
	
public:
    double Speed;   
	
    double fuel ;   
	
public:   
    Boat (string h): Vehicle (h),Speed(50),fuel(8.33){} 
	virtual void showinfo () const
	{
		cout<<name<<endl; 
        cout<<Speed<<"km/h"<<endl; 
        cout<<fuel<<"L/100km"<<endl; 
	}
	
	
};



int main(){

    Vehicle *vp;

    string name0,name1,name2;

    cin>>name0;

    Car car(name0);

    cin>>name1;

    Truck truck(name1);

    cin>>name2;

    Boat boat(name2);

    vp=&car;

    vp->showinfo ();

    vp=&truck;

    vp->showinfo ();

    vp=&boat;

    vp->showinfo ();

    return 0;

}