#include <iostream>

#define print_err_notice() \
  (std::cout << "Error caught in file \"" <<		\
       __FILE__ << "\" at line " << __LINE__ << "\n")

int fred(int x)
{
  int y;
  try 
    {
      y = george(x-2);
    }
  catch (Error e)
    {
      print_err_notice();
      throw;	// re-throw error
    }
  return y;
}

int george(int x)
{
  return harry(1+2*x);
}

int harry(int x)
{
  if ( x < 0 )
    throw Error();
  else
    return 5*x;
}

main()
{
  try
    {
      y = fred(x);
    }
  catch (Error e)
    {
      print_err_notice();
      throw;	// re-throw error
    }
}