using namespace std; class BaseClass {. int i, j; 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(int x) { k = x; } void showk() { cout <;<; k <;<; endl; }. }; int main() {.
