regress/lib/libc/ieeefp/nan/nan.c

   1 /*      $NetBSD: nan.c,v 1.4 2004/03/05 01:00:53 kleink Exp $   */
   2
   3 /*
   4  * This file is in the Public Domain.
   5  *
   6  * Blatently copied from the infinity test by Ben Harris.
   7  *
   8  * Simon Burge, 2001
   9  */
  10
  11 /*
  12  * Check that NAN (alias __nanf) really is not-a-number.
  13  * Alternatively, check that isnan() minimally works.
  14  */
  15
  16 #include <assert.h>
  17 #include <math.h>
  18
  19 int
  20 main(int argc, char **argv)
  21 {
  22
  23         /* NAN is meant to be a (float) NaN. */
  24         assert(isnan(NAN));
  25         assert(isnan((double)NAN));
  26         return 0;
  27 }