# isnanf(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)```

## Check Out this Related Man Page

```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			   |
+-----------------------------+-----------------------------+

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

SunOS 5.11							    15 Jun 2004 							isnand(3C)```
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