下列程序的运行结果是______。
#include＜iostream.h＞
class Sample

int a;
public:
Sample(int aa=0)a=aa;
～Sample( )cout~＜＜"Sample="＜＜a＜＜’’;
;
class Derived:public Sample

int b;
public:
Derived(int aa=0,int bb=0):Sample(aa)(b=bb;
～Derived( )cout＜＜"Derived="＜＜b＜＜";
;
void main( )

Derived d1(9);