问答题

{{*HTML*}}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();
}