#include <iostream>
using namespace std;
class BaseClass {
protected:
int i, j;
public:
void set(int a, int b) {
i = a;
j = b;
}
void show() {
cout << i << " " << j << endl;
}
};
// i and j inherited as protected.
class DerivedClass1 : public BaseClass {
int k;
public:
void setk() {
k = i * j;
}
void showk() {
cout << k << endl;
}
};
// i and j inherited indirectly through DerivedClass1.
class DerivedClass2 : public DerivedClass1 {
int m;
public:
void setm() {
m = i - j;
}
void showm() {
cout << m << endl;
}
};
int main()
{
DerivedClass1 object1;
DerivedClass2 object2;
object1.set(2, 3);
object1.show();
object1.setk();
object1.showk();
object2.set(3, 4);
object2.show();
object2.setk();
object2.setm();
object2.showk();
object2.showm();
return 0;
}
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