#include <iostream>
using namespace std;
class base {
protected:
int i, j; // private to base, but accessible by derived
public:
void setij(int a, int b) { i=a; j=b; }
void showij() { cout << i << " " << j << "\n"; }
};
// Inherit base as protected.
class derived : protected base{
int k;
public:
// derived may access base's i and j and setij().
void setk() { setij(10, 12); k = i*j; }
// may access showij() here
void showall() { cout << k << " "; showij(); }
};
int main()
{
derived ob;
ob.setk(); // OK, public member of derived
ob.showall(); // OK, public member of derived
return 0;
}
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