Day02-01. C++ 레퍼런스변수

#include<iostream>
using namespace std;
void change( int &a,int &b);
void main()
{
 int a = 10;
 int b = 20;
 
 change(a,b);
 cout<<a<<endl; // 20
 cout<<b<<endl; // 10
}
void change( int &a,int &b)
{
 int tmp;
 
 tmp = a;
 a=b;
 b=tmp;
}