Inheritance

#include <vector>
#include <iostream>
class A{ 
public:
	virtual int getInt() { return 3; }
};
class B : public A{
public:
	int getInt() { return 2; }
};
class C : public A{
public:
	int getInt() { return 4; }
};

void main(){
	C c;
	B b; 

	A* a = &b; 

	if (dynamic_cast<B*>(a)){
		std::cout << dynamic_cast<B*>(a)->getInt() << std::endl;
	}
	// if the object can't be converted to the type C, 
	// because it never inherited it then it'll return nullptr
	if (dynamic_cast<C*>(a)){
		std::cout << dynamic_cast<B*>(a)->getInt() << std::endl;
	}  
}