#include <iostream>
class Person
{
public:
static int age;
};
class Student: public Person
{
public:
static int age;
int grade;
};
int Person::age = 5;
int Student::age = 15;
int main()
{
using namespace std;
Student s;
cout << "age " << s.age << endl;
cout << "Person::age " << s.Person::age << endl;
cout << "age " << Student::age << endl;
cout << "Person::age " << Student::Person::age << endl;
return 0;
}
$ ./a.out
age 15
Person::age 5
age 15
Person::age 5