#include <iostream>
#include <iomanip>

int a[4] = {10, 20, 30, 40};

int& g(int x) {
  return *(a + x);
}

int main() {

  cout << endl << "a[0] = " << a[0] << endl;
  cout << "a[1] = " << a[1] << endl;
  cout << "a[2] = " << a[2] << endl;
  cout << "a[3] = " << a[3] << endl << endl;

  cout << "&a[0] = " << hex << &a[0] << endl;
  cout << "&a[1] = " << hex << &a[1] << endl;
  cout << "&a[2] = " << hex << &a[2] << endl;
  cout << "&a[3] = " << hex << &a[3] << endl << endl;
 
  g(0) = 15; 
  g(1) = 25;
  g(2) = 35;
  g(3) = 45;

  cout << endl << dec << "a[0] = " << a[0] << endl;
  cout << "a[1] = " << a[1] << endl;
  cout << "a[2] = " << a[2] << endl;
  cout << "a[3] = " << a[3] << endl << endl;

  cout << "&a[0] = " << hex << &a[0] << endl;
  cout << "&a[1] = " << hex << &a[1] << endl;
  cout << "&a[2] = " << hex << &a[2] << endl;
  cout << "&a[3] = " << hex << &a[3] << endl << endl;
}