#include <iostream.h>
class A{
private:
   static int n;
   int X;
public:
   A(int x=0){X=x;n++;}
   ~A(){n--;}
   static int GetNum(){return n;}
   void print();
};
void A::print(){cout<<"n="<<n<<","X="<<X<<endl;}
int A::n=0;
void main()
{
    A*p=new A(12);
    p->print();
    A a(34);
    a.print();
    delete p;
cout<<"n="<<A::GetNum()<<endl;
}  


第二道

#include<iostream.h>
class A
{
public:
int n;
};
class B:virtual public A{};
class C:virtual public A{};
class D:public B,public C
{
int getn(){return B::n;}
};
void main()
{
D d;
d.B::n=10;
d.C::n=20;
cout<<d.B::n<<","<<d.C::n<<endl;
}

两道都是考试题，麻烦各位大侠帮帮忙了