#include "library.h"

const double limit = 0.5;

double line(const double length)
{ if (length > limit)
  { const double third = length/3;
  
    const double a = line(third);
    
    turn_left_by_degrees(60);
    const double b = line(third);
    
    turn_right_by_degrees(120);
    const double c = line(third);
    
    turn_left_by_degrees(60);
    const double d = line(third);
    
    return a + b + c + d; }
    
  else
  { draw_distance(length);
    return length; } }


void main()
{ make_window(600, 600);
  move_to(100, 150);
   set_heading_degrees(90);
  set_pen_width(3);

  const double a = line(400);
  turn_right_by_degrees(120);
  
  const double b = line(400);
  turn_right_by_degrees(120);
  
  const double c = line(400);
  turn_right_by_degrees(120);
  
  print("total length ");
  print(a + b + c);
  new_line(); }