#include <iostream>

using namespace std;

struct array_of_4_ints
{ int v[4];

  int access(int index)
  { if (index >=0 && index < 4)
      return v[index];
    cout << "error in index\n";
    exit(1); }

  void set(int index, int value)
  { if (index >= 0 && index < 4)
      v[index] = value;
    else
    { cout << "error in index\n";
      exit(1); } }
};

int main()
{ int a = 101, b = 202, c = 303;

  array_of_4_ints d;                   
  d.set(0, 1111);
  d.set(1, 2222);
  d.set(2, 3333);
  d.set(3, 4444);

  int e = 404, f = 505, g = 606;

  for (int i = 0; i < 10; i += 1)
    cout << d.access(i) << "\n";

  d.set(f/101, 9999);   

  cout << "a == " << a << "\n";
  cout << "b == " << b << "\n";
  cout << "c == " << c << "\n";
  cout << "e == " << e << "\n";
  cout << "f == " << f << "\n";
  cout << "g == " << g << "\n";
}