Thread: Still trying to understand Polymorphism

Code:

#include <iostream>
using namespace std; 
class A
{
    protected:
        int a ;
        int b;
    public: 
        A()
        {
            a=10;
            b=100;
        }
        virtual int multiply()=0 ;
};
class B:public A
{
    public: 
        int multiply(); 
        int Divide() ;
};
int B::Divide()
{
    return b/a ;
}
int B::multiply()
{
    return a*b ;
}
void main()
{
    
   A *act= new B ;

      cout << act->multiply() ;
     cout << act->Divide() ;//this didn't work

    cout << act  -> B::Divide() ;//also that doesn't work   

}

Polymorphism basic definition: allows dynamic binding, the function type to change during run time..

i wanted A to be able to use the divide function from the B class.
but I get a compiler error saying B is not a member object of a class, something like unambiguous access..
I don't get it... if act points to the class B or object of class B. should I not be able to use member functions of B?
Why does it not work and is there a way to solve this?
Thanks

so you are saying unless 2 objects from different classes have a specific function i can apply for the 2 objects.. i can use polymorphism..
What if I need to use polymorphism and also be able to use the other functions in that child class?

would I have to do this

Code:

A *a = new B ; 
a->multiply(a,b) ;
B b ; 

b.Divide() ; //assuming that the another Class C would does not need a Divide function
//so no reason to include in Base class A

that seems redundant to me..