sunos man page for unordered

isnand(3C)						   Standard C Library Functions 						isnand(3C)

NAME
       isnand, isnanf, finite, fpclass, unordered - determine type of floating-point number

SYNOPSIS
       #include <ieeefp.h>

       int isnand(double dsrc);

       int isnanf(float fsrc);

       int finite(double dsrc);

       fpclass_t fpclass(double dsrc);

       int unordered(double dsrc1, double dsrc2);

DESCRIPTION
       The isnand() and isnanf() functions return TRUE(1) if the argument dsrc or fsrc is a NaN;  otherwise they return FALSE(0).

       The fpclass() function returns one of the following classes to which dsrc belongs:

       FP_SNAN	       signaling NaN

       FP_QNAN	       quiet NaN

       FP_NINF	       negative infinity

       FP_PINF	       positive infinity

       FP_NDENORM      negative denormalized non-zero

       FP_PDENORM      positive denormalized non-zero

       FP_NZERO        negative zero

       FP_PZERO        positive zero

       FP_NNORM        negative normalized non-zero

       FP_PNORM        positive normalized non-zero

       The finite() function returns TRUE(1) if the argument dsrc is neither infinity nor NaN; otherwise it returns  FALSE(0).

       The  unordered() function returns TRUE(1) if one of its two arguments is unordered with respect to the other argument.	This is equivalent
       to reporting whether either argument is NaN.  If neither argument is NaN, FALSE(0) is returned.

       None of these functions generates an exception, even for signaling NaNs.

RETURN VALUES
       See DESCRIPTION.

ATTRIBUTES
       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO
       fpgetround(3C), isnan(3M), attributes(5)

SunOS 5.10							    15 Jun 2004 							isnand(3C)