#include <stdio.h>
#include <stdlib.h>
#include <math.h>

/**
 * Fun with approximation.
 */
int 
main()
{
  double d = 2.0;
  double root = sqrt(d);
  double squared = root * root;
  printf ("The square root of %lf is %lf\n", d, root);
  printf ("%lf squared is %lf\n", root, squared);
  if (d == squared)
    printf ("Yay!  The square of the square root of %lf is %lf.\n", d, d);
  else
    printf ("Boo!  The square of the square root of %lf differs from %lf.\n", 
            d, d);

  return EXIT_SUCCESS;
} // main