#include <iostream>
using namespace std;

int main(){
	// variabel
	int a = 5;

	cout << "address dari a " << &a << endl;
	cout << "  nilai dari a " << a << endl << endl;

	// reference
	int &b = a;

	cout <<	"  nilai dari b " << b << endl;
	cout << "address dari b " << &b << endl << endl;

	b = 10;
	cout << "  nilai dari a " << a << endl;
	cout <<	"  nilai dari b " << b << endl << endl;

	a = 20;
	cout << "  nilai dari a " << a << endl;
	cout <<	"  nilai dari b " << b << endl;
}