#include <stdio.h>

class A {
public: void other () { printf("is an empty func in A\n"); };
  virtual void other (class A *a) { printf("In A\n"); }
};
class B: public A {
public: void other (class B *b) { printf("In B\n"); }
};

int main(void) {
  A a; B b;
  A *aPtr = &a; B *bPtr = &b;
  aPtr = bPtr;
  aPtr->other(bPtr); 
  //  bPtr->other();      
}