写出下列程序的运行结果
#include<iostream.h>
class Datal{
int x;
public:
Data(int x){
Data::X=X;
cout<<"Data cons."<<endl;
}
~Data(){cout<<"Data des."<<endl;}
};
class Base{
Data dl;
public:
Base(int x);dl(x){cout<<"Base cons."<<endl;}
~Base(){cout<<"Base des."<<endl;}
};
class Derived:public Base{
Data d2;
public:
Derived(int x):Base(x), d2(x){cout<<"Derived cons."<<endl;}
~Derived(){cout<<"Derived des."<<endl;
};
void main(){
Derived obj(5);
} 
