#include<stdio.h>
#include<math.h>
#include<stdlib.h>
#define RND (double)rand()/RAND_MAX

int
main ()
{
  for (double x = 0; x < 10; x += 0.2)
    printf ("%g \t%g\n", x, sin (x));
  for (double x = 0; x < 10; x += 1)
    fprintf (stderr, "%g \t%g \t%g\n", x, sin (x)+(RND-0.5)/2, RND/2+0.2);
  return 0;
}