In this code,why line 25 will give bad_cast error?

Question

https://code.sololearn.com/cXWyYH92886F/?ref=app

Answer 1

I think we can't cast from base class to derived class..

Answer 2

use somethinglike this ,

B* rb1=static_cast<B*>(&obA);
rb1->f();

and you can't cast Derived class to Base class,
read this : https://stackoverflow.com/a/8329517