#include <stdio.h>

#include <gsl/gsl_rng.h>

#include <gsl/gsl_randist.h>

int

main (void)

{

  int i;

  double x = 0, y = 0, dx, dy;

  const gsl_rng_type * T;

  gsl_rng * r;

  gsl_rng_env_setup();

  T = gsl_rng_default;

  r = gsl_rng_alloc (T);

  printf ("%g %g\n", x, y);

  for (i = 0; i < 10; i++)

    {

      gsl_ran_dir_2d (r, &dx, &dy;;

      x += dx; y += dy; 

      printf ("%g %g\n", x, y);

    }

  gsl_rng_free (r);

  return 0;

}