isnand(3m) [ultrix man page]

isnand(3m)																isnand(3m)

Name
       isnand, isnanf - test for floating point NaN (Not-A-Number)

Syntax
       int isnand (dsrc)
       double dsrc;

       int isnanf (fsrc)
       float fsrc;

Description
       The and routines return the value 1 for true if the argument dsrc or fsrc is a NaN; otherwise they return the value 0 for false.

       Neither routine generates any exception, even for signaling NaNs.

       The function is implemented as a macro included in <ieeefp.h>.

								       RISC								isnand(3m)

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 5.11							    15 Jun 2004 							isnand(3C)