Determines the class of IEEE floating-point values.

    This function is supported on OpenVMS Integrity servers and
    Alpha only.

    Format

      #include  <math.h>

      int fp_class  (double x);

      int fp_classf  (float x);

      int fp_classl  (long double x);

  Additional Information (explode) :

• Argument
• Description
• Return Value