#include
using namespace std;
class base {
protected:
int i, j;
public:
void set(int a, int b) {
i=a;
j=b;
}
void show() {
cout << i << " " << j << "\n";
}
};
class derived1 : public base {
int k;
public:
void setk() {
k = i*j;
}
void showk() {
cout << k << "\n";
}
};
class derived2 : public derived1 {
int m;
public:
void setm() {
m = i-j;
}
void showm() {
cout << m << "\n";
}
};
int main()
{
derived1 ob1;
derived2 ob2;
ob1.set(2, 3);
ob1.show();
ob1.setk();
ob1.showk();
ob2.set(3, 4);
ob2.show();
ob2.setk();
ob2.setm();
ob2.showk();
ob2.showm();
return 0;
}
2 3
6
3 4
12
-1