C++代码相关问题继承与派生

Question

#include<iostream>
using namespace std;
class Animal{
 protected:
  unsigned int Age;double Weight;string Name;
 public:
  Animal(unsigned int age,double weight,string name)
  {
   Age=age;
   Weight=weight; 
   Name=name;
      cout << "Animal Constructor" << endl;
  }
  Animal()
  {
   cout << "Animal Constructor" << endl;
  }
};
class Fish:virtual public Animal{
 protected:
  bool Fim;
 public:
  Fish(unsigned int age,double weight,string name,bool Fim):Animal(age,weight,name)
  {
   this->Fim=Fim;
       cout << "Fish Constructor" << endl;
  }
  Fish()
  {
     cout << "Fish Constructor" << endl;
  }
};
class TerrestrialAnimal:virtual public Animal{
 protected:
  unsigned int Legs;
 public:
  TerrestrialAnimal(unsigned int age,double weight,string name,unsigned Leg):Animal(age,weight,name)
  {
   Legs=Leg;
      cout << "TerrestrialAnimal Constructor" << endl;
  }
  TerrestrialAnimal()
  {
   cout << "TerrestrialAnimal Constructor" << endl;
  }
};

class Reptile:public Fish,public TerrestrialAnimal{
 public:
  Reptile(unsigned int age,double weight,string name,unsigned int Leg,bool Fim):Animal(age,weight,name),Fish(age,weight,name,Fim),TerrestrialAnimal(age,weight,name,Leg)
  {cout << "Reptile Constructor" << endl;}
 Reptile()
 {
  cout << "Reptile Constructor" << endl;
 } 
 void Print()
 {
        cout << "Reptile Age:" << Age << endl;
    }
};
int main(){
    int age;
    int weight;
    string name;
    int fim_num;
    int leg_num;
    cin >> age >> weight >> name >> fim_num >> leg_num;
    Reptile r1(age, weight, name, fim_num, leg_num);
    r1.Print();
    return 0;
}
  

要求TerrestrialAnimal Constructor输出顺序在Fish Constructor的前面。主函数不变，请问怎么修改代码，谢谢！

Answer 1

把49行继承顺序调换一下：

class Reptile:public TerrestrialAnimal, public Fish

多重继承判断构造顺序要看继承的关系，虚基类先构造，然后是普通基类，然后派生类，同样是虚基类或者同样是普通基类的话根据继承顺序，不是按照初始化列表顺序。