一个对象构造两次，析构两次

#include<iostream>
int n=0;
using namespace std;
 class Cbox{
         int a ;
         int b ;
         int c ;
     public:
         int g ;
     Cbox(int d):a(d),c(d),b(d){cout<<"dddd"<<endl;}
    Cbox(){cout<<"dddd"<<endl;};
    ~Cbox(){cout<<a<<" "<<b<<" "<<c<<endl;}
 };
 
 
 
 int main(){
 int aa=10;
 Cbox a ;
 a=aa;
 //Cbox b(a);//跟   Cbox b=a；   结果一样 
 
 
 
 
 
 }