void maino Circle *ptrs Area obl Perimeter ob2 obl. setr(10) ob2 setr(10); ptr=&obl; ptr->show 0; ptr=&ob2 ptr->showOvoid main() { Circle *ptr; Area ob1; Perimeter ob2; ob1.setr(10); ob2.setr(10); ptr=&ob1; ptr->show(); ptr=&ob2; ptr->show(); }