ISCNAN 3CW "28 December 2009" "mathcw-1.00"

Table of contents


NAME

iscnanf, iscnan, iscnanl, iscnanw, iscnanq, iscnanll, iscnandf, iscnand, iscnandl, iscnandll - test for complex NaN

SYNOPSIS

cc [ flags ] -I/usr/local/include file(s) -L/usr/local/lib -lmcw [ ... ]

#include <mathcw.h>

extern int iscnanf (float z);

extern int iscnan (double z);

extern int iscnanl (long double z);

extern int iscnanw (__float80 z);

extern int iscnanq (__float128 z);

extern int iscnanll (long_long_double z);

extern int iscnandf (decimal_float z);

extern int iscnand (decimal_double z);

extern int iscnandl (decimal_long_double z);

extern int iscnandll (decimal_long_long_double z);

NB: Functions with prototypes containing underscores in type names may be available only with certain extended compilers.


DESCRIPTION

Determine whether the argument is a NaN (either quiet or signaling).

The C99 Standard, Annex G.3, requires that a complex value is infinite if at least one component is Infinity, even if the other is a NaN. Thus, a complex number is a NaN if neither imaginary nor real components are Infinity, and at least one of them is a NaN.


RETURN VALUES

Return 1 if the argument is a NaN, and 0 otherwise.

ERRORS

None.

SEE ALSO

fpclassify(3CW), iscinf(3CW), isfinite(3CW), isinf(3CW), isnan(3CW), isnormal(3CW), issubnormal(3CW).