5.11

#include <iostream>

using namespace std;

class BaseClass

{

public:

    BaseClass();

};

BaseClass::BaseClass()

{

cout << "构造基类对象!" << endl;

}

class DerivedClass :public BaseClass  {

public:

    DerivedClass();

};

DerivedClass::DerivedClass();

cout << "构造派生类对象!" << endl;

}

int main() {

    DerivedClass d;

    return 0;

}