int main(int argc, char** argv)
  {
    int x = 3, y = 4, z = 5;
    int& xRef = x;
    xRef = 10;
    //  int& emptyRef; // DOES NOT COMPILE!
  
    //  int& unnamedRef = 5; // DOES NOT COMPILE
    const int& unnamedRef = 5; // works as expected
  
    xRef = y; // changes value of x to 4. Doesn't make xRef refer to y.
  
    int& zRef = z;
    zRef = xRef; // Assigns values, not references
  
    int* intP;
    int*& ptrRef = intP;
    ptrRef = new int;
    *ptrRef = 5;
  
    int* xPtr = &xRef; // address of a reference is pointer to value
    *xPtr = 100;
  
    //  int&& xDoubleRef = xRef; // DOES NOT COMPILE!
    // int&* refPtr = &xRef; // DOES NOT COMPILE!
  
    return (0);
  }