Question

这是我的c ++介绍webclass 11中的第10节（1/1）;

我可能还没有完成这项练习，但我真的不知道如何继续这一点。

这项练习是从另一种语言翻译出来的，如果我错过或输错了一些变数，我会提前道歉，如果指出的话会尝试纠正它们。

我很难理解当一些函数来自一个被继承的类时，如何构造一个新对象，不确定哪些条件甚至可以搜索，（在第二部分中）Car::Car(string make, string model, string rego, bool onoff): Vechile(weight, top_speed, driven_km) 应该从主要的Car carX(weight, speed, km, make, model, rego, 0);中获取它的值

如何正确构造（？）carX对象？ weight, top_speed, driven_km的值继承自Vechile类，我假设我需要按照提供的main（）以正确的顺序（例如weight, speed, km, make, model, rego, onoff）呈现修饰符练习计划），

但我无法通过Web界面编译器中的任何其他组合使代码超过Car::Car(string make, string model, string rego, bool onoff): Vechile(weight, top_speed, driven_km)。

我是否正确，还有其他我想念的东西吗？

代码中的函数仍然大部分正在进行中，可能会或可能不会像现在一样工作，但如果你不介意，我宁愿只帮助解决与OOP相关的问题。问题。

感谢您的时间。

第1部分：不可编辑的顶部（vechile类）;

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

class Vechile
{
  public:
  int weight;
  int top_speed;
  long driven_km;
  Vechile(int weight, int top_speed, long driven_km);
  void drive(int km_togo);
  int GiveWeight();
  int GiveTopspeed();
  long GiveDrivenKm();
};

Vechile::Vechile(int Ap, int Ahn, long Akm)
{
  weight = Ap;
  top_speed = Ahn;
  driven_km = Akm;
}

void Vechile::drive(int km_togo)
{
  driven_km += km_togo;
}

int Vechile::GiveWeight()
{
  return weight;
}

int Vechile::GiveTopspeed()
{
  return top_speed;
}

long Vechile::GiveDrivenKm()
{
  return driven_km;
}

第2节：到目前为止我所做的:(汽车类，检查汽车功能）

    class Car : public Vechile
{
    public:
    string rego, model, make;
    bool onoff;

    Car(string make,string model,string rego, bool onoff);


char check();
char start();

};
       Car::Car(string make, string model, string rego, bool onoff):
        Vechile(weight, top_speed, driven_km)


        {

        Car::make = make;
        Car::model = model; 
        Car::driven_km = driven_km; 
        Car::rego = rego;
        Car::top_speed = top_speed;
        Car::weight = weight;
        Car::onoff = onoff; 
        }   

        char Car::check()
        {
            cout << "Car Info:" << endl;
            cout << "Make:"<< Car::make << endl;
            cout << "Model:"<< Car::model<< endl;
            cout << "Driven KM:"<< Car::driven_km << endl;
            cout << "Weight" << Car::weight << endl; 
            cout << "Top_speed:"<< Car::top_speed << endl;
            cout << "rego:"<< Car::rego << endl;

            if(Car::onoff = 0) 
            { 
                cout << "Car is not started"<<endl;
            } 
            else 
            { 
                cout << "Car is started"<<endl; 
            }
        }
        char Car::start()
        {
        onoff = 1;

    }

第3节：不可编辑的主要内容;

int main()
{
    int weight, speed;
    long km;
    string make, model, rego;

    cout << "Give make of Car: ";
    cin >> make;

    cout << "Give model of car: ";
    cin >> model;

    cout << "Give registration of car: ";
    cin >> rego;

    cout << "Give weight of car: ";
    cin >> weight;

    cout << " Give top speed of car";
    cin >> speed;

    cout << "Enter driven km";
    cin >> km;

    cout << endl;

    Car carX(weight, speed, km, make, model, rego, 0);

    carX.check();
    carX.start();
    carX.drive(95);
    cout << endl;
    carX.check();
}

Answer 1

Car::Car(string make, string model, string rego, bool onoff):
    Vechile(weight, top_speed, driven_km)

:表示您正在调用Vechile的构造函数。但是，您尚未提供weight，top_speed和driven_km的内容。

您必须在Car构造函数中包含这些参数。

Car::Car(int weight, int top_speed, long driven_km, string make, string model, string rego, bool onoff):
    Vechile(weight, top_speed, driven_km)

理解OOP类继承/关系c ++

1 个答案: