#include
using namespace std;
class BaseClass {
protected:
int i, j; // private to BaseClass, but accessible to DerivedClass
public:
void set(int a, int b) {
i = a;
j = b;
}
void show() {
cout << i << " " << j << endl;
}
};
class DerivedClass : public BaseClass {
int k;
public:
// DerivedClass may access BaseClass's i and j
void setk() {
k = i*j;
}
void showk() {
cout << k << endl;
}
};
int main()
{
DerivedClass ob;
ob.set(2, 3);
ob.show();
ob.setk();
ob.showk();
return 0;
}