#include <iostream>


using namespace std ;


int main()
{
   int x1 = 10 ;    int y1 = 30 ;

   //Need to initialize rvalue references
   int&& x1R  = 10 ;
   int&& x2R  = 11 ;


   //Have it "point" to x1
   int& x1L = x1 ;
   x1 = 12 ;
   x1R = x1L ;

   //Explain the output
   cout << "x1: " << x1 << endl ;
   cout << "x1L: " << x1L << endl ;
   cout << "x1R: " << x1R << endl ;

return 0 ;
}