有一个汽车类vehicle，它具有一个需要传递参数的构造函数，类中的数据成员包括：车轮个数wheels和车重weight作为保护成员；小车类car是它的私有派生类，其中包含载人数passengers；卡车类truck是vehicle的私有派生类，其中包含载人数passensers和载重量payload；每个类中有相应的输出函数，输出函数名见主函数。执行并输出结果。主函数如下：intmain(){vehicleobj1(4,4);cout<<"vehicleinformation:"<<endl;obj1.display();carobj2(4,2,5);cout<<endl<<"carinformation:"<<endl;obj2.display();truckobj3(8,6,2,20);cout<<endl<<"truckinformation:"<<endl;obj3.display();return0;}

这是同样的问题，我已经回答过了，以下是代码实现：

#include <iostream>
using namespace std;

class Vehicle {
protected:
    int wheels;
    int weight;
public:
    Vehicle(int w, int we): wheels(w), weight(we) {}
    void display() {
        cout << "Wheels: " << wheels << endl;
        cout << "Weight: " << weight << endl;
    }
};

class Car: private Vehicle {
private:
    int passengers;
public:
    Car(int w, int we, int p): Vehicle(w, we), passengers(p) {}
    void display() {
        cout << "Wheels: " << wheels << endl;
        cout << "Weight: " << weight << endl;
        cout << "Passengers: " << passengers << endl;
    }
};

class Truck: private Vehicle {
private:
    int passengers;
    int payload;
public:
    Truck(int w, int we, int p, int pay): Vehicle(w, we), passengers(p), payload(pay) {}
    void display() {
        cout << "Wheels: " << wheels << endl;
        cout << "Weight: " << weight << endl;
        cout << "Passengers: " << passengers << endl;
        cout << "Payload: " << payload << endl;
    }
};

int main() {
    Vehicle obj1(4, 4);
    cout << "Vehicle Information:" << endl;
    obj1.display();

    Car obj2(4, 2, 5);
    cout << endl << "Car Information:" << endl;
    obj2.display();

    Truck obj3(8, 6, 2, 20);
    cout << endl << "Truck Information:" << endl;
    obj3.display();

    return 0;
}

输出结果为：

Vehicle Information:
Wheels: 4
Weight: 4

Car Information:
Wheels: 4
Weight: 2
Passengers: 5

Truck Information:
Wheels: 8
Weight: 6
Passengers: 2
Payload: 20