fp_class(3) — NEWS-os 5.0.1



fp_class(3)             LIBRARY FUNCTIONS             fp_class(3)



NAME
     fp_class - classes of IEEE floating-point values

SYNOPSIS
     #include <fpclass.h>

     int fpclassd(double x);
     int fpclassf(float x);

DESCRIPTION
     These routines are used  to  determine  the  class  of  IEEE
     floating-point  values.  They return one of the constants in
     the file <fp_class.h> and never cause an exception even  for
     signaling NaN's.  These routines are to implement the recom-
     mended  function  class(x)  in  the  appendix  of  the  IEEE
     754-1985 standard for binary floating-point arithmetic.

     The constants in <fp_class.h> refer to the following classes
     of values:

     Constant       Class
     FP_SNAN        Signaling NaN (Not-a-Number)
     FP_QNAN        Quiet NaN (Not-a-Number)
     FP_POS_INF     +oo (positive infinity)
     FP_NEG_INF     -oo (negative infinity)
     FP_POS_NORM    positive normalized non-zero
     FP_NEG_NORM    negative normalized non-zero
     FP_POS_DENORM  positive denormalized
     FP_NEG_DENORM  negative denormalized
     FP_POS_ZERO    +0.0 (positive zero)
     FP_NEG_ZERO    -0.0 (negative zero)

ALSO SEE
     ANSI/IEEE Std 754-1985, IEEE Standard for  Binary  Floating-
     Point Arithmetic




















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