Simple Program of C Program

#include
void f ();
int i = 0;
void main ()
 {
  cout << i << endl;
  int i = 1;
  cout << i << endl;
  {
    int i = 2;
    cout << i << endl;
    {
      int i = 3;
      cout << i << endl;
      {
int i = 4;
cout << i << endl;
      }
      cout << i << endl;
    }
    cout << i << endl;
  }
  cout << i << endl;
  f(); f(); f();
}

void f ()
{
  cout << i << endl;
  int i = 5;
  cout << i++ << endl;
}