Content-type: text/html Man page of isnand

isnand

Section: Standard C Library Functions (3C)
Updated: 15 Jun 2004
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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 TYPEATTRIBUTE VALUE
MT-LevelMT-Safe

 

SEE ALSO

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


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUES
ATTRIBUTES
SEE ALSO

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Time: 02:37:18 GMT, October 02, 2010