#include <iostream>
#include <string>
using namespace std;
class myclass1{ public: long mynum1; };
class myclass2{public:	int mynum2;};
class Derived1 :public myclass2
{
// a derived class
// an example of inhertance
// simple steps of evolution to object polymorphism
};
int main()
{
		myclass1 a1 ;
		myclass2 a2 ;
		Derived1 der1; 
		a2.mynum2 = 12; 
		// member-object to member-object
		a1.mynum1 = a2.mynum2; 
		cout<<a2.mynum2 << endl;; 
		cout << (der1.mynum2 =24); 
	return 0;
}