给出下面程序输出结果。

#include <iostream.h>

class Base

{private:

int Y;

public:

Base(int y=0) {Y=y;cout<<"Base("<<y<<")＼n";}

~Base() {cout<<"~Base()＼n";}

void print() {cout <<Y<< "";}

};

class Derived:public Base

{private:

int Z;

public:

Derived (int y, int z):Base(y)

{Z=z;

cout<<"Derived("<<y<<","<<z<<")＼n";

}

~Derived() {cout<<"～Derived()＼n";}

void print()

{Base::print();

cout<<Z<<endl;

}

};

void main()

{Derived d(10,20);

d.print();

}

答案：Base(10)

Derived(10,20)

10 20

～Derived()

~Base()

［解析］派生类对象，先调用基类构造函数输出Base(10)，后调用派生类构造函数输出Derived(10,20)，后执行d.print(),调用派生类的print，再调用Base::print()输出10，后返回输出z的值20。后派生类析构，再基类析构。