1  #include <math.h>
       2  
       3  static const double zero =  0.0;
       4  static const double pone =  1.0;
       5  static const double none = -1.0;
       6  static const double pinf =  1.0 / 0.0;
       7  static const double ninf = -1.0 / 0.0;
       8  
       9  int
      10  main ()
      11  {
      12    if (pinf != pone/zero)
      13      abort ();
      14  
      15    if (ninf != none/zero)
      16      abort ();
      17  
      18  #ifdef HUGE_VAL
      19    if (HUGE_VAL != pinf)
      20      abort ();
      21  
      22    if (-HUGE_VAL != ninf)
      23      abort ();
      24  #endif
      25  
      26    exit (0);
      27  }