#include
using std::cout;
using std::endl;
int main()
{
int x = 321;
int &y = x;
cout << "x = " << x << " y = " << y << endl;
y = 123;
cout << "x = " << x << " y = " << y << endl;
return 0;
}
x = 321 y = 321
x = 123 y = 123