下列程序的运行结果是______。
#included<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);