デフォルトの関数の引数

Question

私はこの

#include <iostream> 
#include <string> 
using namespace std; 
class Vehicle { 
protected: 
    int Number; 
    int Year; 
    string Make; 
    string BodyStyle; 
    string Model; 
    string Color; 
    int Cost; 
public: 
    Vehicle() {} 
    Vehicle(int num, int year1, string make1, int bStyle1, 
      int model1, int color1, int cost1) 
    { 
     Number = num; 
     Year = year1; 
     Make = make1; 
     BodyStyle = bStyle1; 
     Model = model1; 
     Color = color1; 
     Cost = cost1; 
    } 
    void display() { 
     cout << "---This is Vehicle Class.---" << endl; 
     cout << "Number: " << Number << endl; 
     cout << "Year: " << Year << endl; 
     cout << "Make: " << Make << endl; 
     cout << "BodyStyle: " << BodyStyle << endl; 
     cout << "Model: " << Model << endl; 
     cout << "Color: " << Color << endl; 
     cout << "Cost: " << Cost << endl; 
    } 
}; 

Vehicleクラスのようなプログラムは、三つのクラス

1. トラック車両
2. オートバイの車両
3. トレーラによって実装されている場合。

Vehicleクラスを実装するファーストクラスです。

class TruckVehicle : Vehicle { 
protected: 
    int Passengers; 
    int Mileage; 
    int GrossWeight; 
    string PoweredBy; 
    int TempGross; 
public: 
    TruckVehicle(int number, int year, string make, string model, 
       string bStyle, string color, int cost, 
       int passengers, int mileage, int gWeight, 
       string pBy, int tGross) 
    { 
     Number = number; 
     Year = year; 
     Make = make; 
     BodyStyle = bStyle; 
     Model = model; 
     Color = color; 
     Cost = cost; 
     Passengers = passengers; 
     Mileage = mileage; 
     GrossWeight = gWeight; 
     PoweredBy = pBy; 
     TempGross = tGross; 
    } 
    void display() { 
     cout << "---This is TruckVehicle class.---" << endl; 
     cout << "Number: " << Number << endl; 
     cout << "Year: " << Year << endl; 
     cout << "Make: " << Make << endl; 
     cout << "BodyStyle: " << BodyStyle << endl; 
     cout << "Model: " << Model << endl; 
     cout << "Color: " << Color << endl; 
     cout << "Cost: " << Cost << endl; 
     cout << "Passenger: " << Passengers << endl; 
     cout << "Mileage: " << Mileage << endl; 
     cout << "GrossWeight: " << GrossWeight << endl; 
     cout << "PoweredBy: " << PoweredBy << endl; 
     cout << "TempGross: " << TempGross << endl; 
    } 
}; 

Vehicleクラスを実装する第2のクラス。

class MotorcycleVehicle : Vehicle { 
protected: 
    int Passengers; 
    int Mileage; 
public: 
    MotorcycleVehicle(int number, int year, string make, string model, 
         string bStyle, string color, int cost, 
         int passenger, int mileage) 
    { 
     Number = number; 
     Year = year; 
     Make = make; 
     BodyStyle = bStyle; 
     Model = model; 
     Color = color; 
     Cost = cost; 
     Passengers = passenger; 
     Mileage = mileage; 
    } 
    void display() { 
     cout << "---This is Motor Cycle Class.---" << endl; 
     cout << "Number: " << Number << endl; 
     cout << "Year: " << Year << endl; 
     cout << "Make: " << Make << endl; 
     cout << "BodyStyle: " << BodyStyle << endl; 
     cout << "Model: " << Model << endl; 
     cout << "Color: " << Color << endl; 
     cout << "Cost: " << Cost << endl; 
    } 
}; 

Vehicleクラスを実装する第3クラス。

class TrailerVehicle : protected Vehicle { 
protected: 
    int GrossWeight; 
public: 
    TrailerVehicle() { 
     GrossWeight = 0; 
    } 
    TrailerVehicle(int number, int year, string make, string model, 
        string bStyle, string color, int cost, int gWeight) 
    { 
     Number = number; 
     Year = year; 
     Make = make; 
     BodyStyle = bStyle; 
     Model = model; 
     Color = color; 
     Cost = cost; 
     GrossWeight = gWeight; 
    } 
    void display() { 
     cout << "---This is Trailer Vehicle Class.---" << endl; 
     cout << "Number: " << Number << endl; 
     cout << "Year: " << Year << endl; 
     cout << "Make: " << Make << endl; 
     cout << "BodyStyle: " << BodyStyle << endl; 
     cout << "Model: " << Model << endl; 
     cout << "Color: " << Color << endl; 
     cout << "Cost: " << Cost << endl; 
     cout << "GrossWeight: " << GrossWeight << endl; 
    } 
}; 

トレーラ車クラスはTravelTrailerVehicleで実装されています。

class TravelTrailerVehicle : TrailerVehicle { 
protected: 
    int Passengers; 
    int Mileage; 
    string PoweredBy; 
    int BodyNumber; 
    int Length; 
public: 
    TravelTrailerVehicle(int number,int year,string make, string model, 
         string bStyle,string color,int cost, 
         int gWeight,int passengers,int mileage) 
    { 
     GrossWeight = gWeight; 
     Passengers= passengers; 
     Mileage= mileage; 
     Year = year; 
     Make = make; 
     Model = model; 
     BodyStyle = bStyle; 
     Color = color; 
     Number = number; 
     Cost = cost; 
    } 
    void display() { 
     cout << "----This is Travel Trailer Class.----" << endl; 
     cout << "Number: " << Number << endl; 
     cout << "Year: " << Year << endl; 
     cout << "Make: " << Make << endl; 
     cout << "Model:" << Model << endl; 
     cout << "BodyStyle: " << BodyStyle << endl; 
     cout << "Color: " << Color << endl; 
     cout << "Cost:" << Cost << endl; 
     cout << "GrossWeigth: " << GrossWeight << endl; 
     cout << "Passengers: " << Passengers << endl; 
     cout << "Mileage: " << Mileage << endl; 
    } 
}; 

メインメソッド。

int main() { 
    TruckVehicle Truck1(111111, 2014,"Toyota", "Tacoma","4x4","Black",25000, 2, 15000, 333333,"Gas", 222222); 
    MotorcycleVehicle Motorcycle1(2222222,2015,"Honda", "Gold Wing","Coupe","Red",5000, 1, 3250); 
    TravelTrailerVehicle Trailer1(123456789, 2015, "Toyota", "Camry","Coupe","Red", 20000, 666666, 5, 9855); 
    Truck1.display(); 
    Motorcycle1.display(); 
    Trailer1.display(); 
    system("pause"); 
    return 0; 
} 

誰かが私に、「すべてのコンストラクタのために必要なコードを最小限にするために、デフォルトの関数パラメータとメンバーリストを使用する」が何を意味するかのヒントを与えることができます。

Answer 1

この回答は参考にすべきである：

C++ superclass constructor calling rules

また、表示方法のためにあなたは、詳細な説明については、以下のリンクを参照してください、多型を達成するために仮想機能を使用して検討する必要があります。

C++ referece: Polymorphism