2014-11-05 Puzzler

This code compiles without errors or warnings:

#include 
#include 

using namespace std;

class Point {
public:
  Point(int x, int y) : x_(x), y_(y) {}
  string toString() {
    string result("(");
    return result + to_string(x_) + ", " + to_string(y_) + ")";
  }
 
  int &x_;
  int &y_;
};

int main() {
  int x = 1;
  int y = 2;
  Point p(x,y);
  cout << "First p = " << p.toString() << endl;

  x = 10;
  y = 20;
  cout << "Second p = " << p.toString() << endl;

  int qx = 100;
  int qy = 200;
  Point q(qx, qy);
  cout << "Third p = " << p.toString() << endl;
  cout << "First q = " << q.toString() << endl;
  
  return 0;
}

(1) What does it print?

$ ./a.out 
First p = (1, 2)
Second p = (0, 6304064)
Third p = (100, 200)
First q = (0, 6304064)