#include<iostream> using namespace std; class A { public: static int num; }; int A::num=100; class B:public A { public: int i; B(int m):i(m) {} }; //int B::num=200; int main() { B b(5); cout << b.num << endl; b.num = 10; cout << b.num << endl; cout << B::num << endl; cout << A::num << endl ; cout << &B::num << endl; cout << &A::num << endl; cout << &b.num << endl; return 0; }