题目描述：
编写一个程序，其中有一个汽车类vehicle，它具有一个需要传递参数的构造函数，类中的数据成员：车轮个数wheels和车重weight放在保护段中；小车类car是它的私有派生类，其中包含载人数passager_load；卡车类truck是vehicle的私有派生类，其中包含载人数passager_load和载重量payload。每个类都用相关数据的输出方法。
程序代码：
#include<iostream>
using namespace std;
class Vehicle
{
public:
Vehicle(int wl,double wh):wheels(wl),weight(wh){};
void show()
{
cout<<"wheels:"<<wheels<<",weight:"<<weight<<endl;
}
protected:
int wheels;
double weight;
};
class Car:private Vehicle
{
public:
Car(int wl,double wh,int pl):Vehicle(wl,wh),passager_load(pl){};
void show()
{
Vehicle::show();
cout<<"passager_load:"<<passager_load<<endl;
}
private:
int passager_load;
};
class Truck:private Vehicle
{
public:
Truck(int wl,double wh,int pl,double psl):Vehicle(wl,wh),passager_load(pl),payload(psl){};
void show()
{
Vehicle::show();
cout<<"passager_load:"<<passager_load<<endl;
cout<<"payload:"<<payload<<endl;
}
private:
int passager_load;
double payload;
};
int main()
{
Vehicle v1(4,200);
v1.show();
cout<<"===================="<<endl;
Car c1(4,290,10);
c1.show();
cout<<"===================="<<endl;
Truck t1(4,500,50,200);
t1.show();
return 0;
}结果输出：
wheels:4,weight:200 ==================== wheels:4,weight:290 passager_load:10 ==================== wheels:4,weight:500 passager_load:50 payload:200