一个对象构造两次，析构两次

 1 #include<iostream>
 2 int n=0;
 3 using namespace std;
 4  class Cbox{
 5          int a ;
 6          int b ;
 7          int c ;
 8      public:
 9          int g ;
10      Cbox(int d):a(d),c(d),b(d){cout<<"dddd"<<endl;}
11     Cbox(){cout<<"dddd"<<endl;};
12     ~Cbox(){cout<<a<<" "<<b<<" "<<c<<endl;}
13  };
14
15
16
17  int main(){
18  int aa=10;
19  Cbox a ;
20  a=aa;
21  //Cbox b(a);//跟   Cbox b=a；   结果一样
22
23
24
25
26
27  }
28