/*
   This version is more robust because it does not rely
   on the first point plotted being for x=0.

   Formula_plot is responsible for getting the pen into
   the right place to start the graph, then calling on
   another function to do the plotting.

   Formula_plot_rest does all the plotting in exactly
   the same way as the previous version, but without
   having to worry about whether to draw_to or move_to
*/


#include "library.h"  

double f(double x)
{ const double A = x*x*x/1e6;
  return cos(A)*1e4/(x+1) + 250; }

void formula_plot_rest(int A, int B)
{ const int x = A;
  const int y = f(x);
  draw_to(x, y);    
  if (A < B)
    formula_plot_rest(A+1, B); }

void formula_plot(int A, int B)
{ const int x = A;
  const int y = f(x);
  move_to(x, y);
  if (A < B)
    formula_plot_rest(A+1, B); }

void main()
{ make_window(500, 500);
  formula_plot(100, 500, f); }