#include "stdafx.h"
#include <iostream>
#include <string>
int main() {
using namespace std;
int num = 0;
int &ref = num; //선언과 동시에 초기화!
cout << num << ", " << ref << endl;
num += 1;
cout << num << ", " << ref << endl;
ref += 1;
cout << num << ", " << ref << endl;
return 0;
}