有一个汽车类Vehicle，将它作为基类派生公共汽车类Bus、卡车类Truck，其中Bus包含速度、重量和乘客数，Truck包含速度、重量和载货量，根据以下代码设计相关的类。 #include <iostream> using namespace std; //在此补全相关类 void test(Vehicle &ref) { ref.ShowMember(); cout<<endl; } int main() { float speed;//交通工具速度 float weight;//交通工具重量 int passagers ;//公共汽车乘客数 float load;//卡车载重量 cin>>speed>>weight>>passagers; Bus b(speed,weight,passagers); cin>>speed>>weight>>load; Truck t(speed,weight,load); test(b); test(t); return 1; } 【输入形式】 【输出形式】 【样例输入】 100 5 50 150 10 20 【样例输出】 speed=100,weight=5,passagers=50 speed=150,weight=10,load=20c++

#include <iostream>
using namespace std;

class Vehicle
{
protected:
    float speed;
    float weight;
public:
    Vehicle(){}
    Vehicle(float s, float w): speed(s), weight(w){}
    virtual void ShowMember() const
    {
        cout << "speed=" << speed << ",weight=" << weight;
    }
};

class Bus : public Vehicle
{
private:
    int passagers;
public:
    Bus(){}
    Bus(float s, float w, int p): Vehicle(s, w), passagers(p){}
    virtual void ShowMember() const
    {
        Vehicle::ShowMember();
        cout << ",passagers=" << passagers;
    }
};

class Truck : public Vehicle
{
private:
    float load;
public:
    Truck(){}
    Truck(float s, float w, float l): Vehicle(s, w), load(l){}
    virtual void ShowMember() const
    {
        Vehicle::ShowMember();
        cout << ",load=" << load;
    }
};

void test(Vehicle &ref)
{
    ref.ShowMember();
    cout << endl;
}

int main()
{
    float speed;
    float weight;
    int passagers;
    float load;
    cin >> speed >> weight >> passagers;
    Bus b(speed, weight, passagers);
    cin >> speed >> weight >> load;
    Truck t(speed, weight, load);
    test(b);
    test(t);
    return 1;
}