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

#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);

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

FP_QNAN

FP_NINF

FP_PINF

FP_NDENORM

FP_PDENORM

FP_NZERO

FP_PZERO

FP_NNORM

FP_PNORM

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.

See DESCRIPTION.

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

ATTRIBUTE TYPE	ATTRIBUTE VALUE
MT-Level	MT-Safe

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