下面这个代码为什么打印顺序是这样子的？萌新提问！#include<iostream>using namespace std;class Base{private: int b;public: Base(int c); ~Base();};Base::Base(int c){ b=c; cout<<"Base "<<b<<" says hello"<<endl;}Base::~Base(){ cout<<"Base "<<b<<" says goodbye"<<endl;}class Derived:public Base{private: int d;public: Derived(int c,int b):Base(c) { d=b; cout<<"Derived "<<d<<" says hi"<<endl; } ~Derived() { cout<<"Derived "<<d<<" says bye"<<endl; }};int main(){ int a,b; cin>>a>>b; Derived dr(a,b); return 0;}