Untitled

#include<iostream>
using namespace std;
class first;
class second
{
	private:int s;
	public:void get()
	{
		cout<<"enter a number:";
		cin>>s;
	}
	friend void sum(second,first);
}
class first
{
	private:int f;
	public:void get()
	{
	cout<<"enter a number:";
	cin>>f;
	}
	friend void sum(second,first);
}
		void sum(second s1,first f1)
{
	cout<<"\nsum="<<s.s+f.f;
}
int main()
{
	first f1;
	second s1;
	f1.get();
	s1.get();
	sum(s1,f1);
	return 0;

}