#include <iostream>

int getData(){
  return 9;
}

int main(){
  int x = 10;
  int & lvalueRef = x;   // lvalueRef is a lvalue reference
  std::cout<<lvalueRef<<"\n"; // output: 10

  //int & lvalueRef2 = (x+1); // Error - lvalue Reference Can't point to rvalue
  //invalid initialization of non-const reference of type 'int&' from an rvalue of type 'int'

  int && rvalueRef = (x+1); // rvalueRef is rvalue reference
  std::cout<<rvalueRef<<"\n";    // output: 11
  
  //int & lvalueRef3 = getData(); // Error - lvalue Reference Can't point to rvalue
  //invalid initialization of non-const reference of type 'int&' from an rvalue of type 'int'
  
  const int & lvalueRef4 = getData(); // OK but its const
  int && rvalueRef5 = getData();
  std::cout<<rvalueRef5<<"\n";  // output: 9
}