isnanf(3C)
NAME
isnan, isnand, isnanf, finite, fpclass, unordered - deter-
mine 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);
#include <math.h>
int isnan(double dsrc);
DESCRIPTION
The isnan() function is identical to the isnand() function.
The isnanf() function is implemented as a macro included in
the <ieeefp.h> header.
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
None of these routines generates an exception, even for sig-
naling NaNs.
RETURN VALUES
The isnan(), isnand(), and isnanf() function return TRUE (1)
if the argument dsrc or fsrc is a NaN; otherwise they
return FALSE (0).
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.
ATTRIBUTES
See attributes(5) for descriptions of the following attri-
butes:
____________________________________________________________
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
|_____________________________|_____________________________|
| MT-Level | MT-Safe |
|_____________________________|_____________________________|
SEE ALSO
fpgetround(3C), attributes(5)
Man(1) output converted with
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