NAME

isnan, isnand, isnanf − test for IEEE floating point NaN (Not-a-Number)

SYNOPSIS

#include <math.h>

int isnan (arg)
double arg;

#include <ieeefp.h>

int isnand (arg)
double arg;

int isnanf (arg)
float arg;

DESCRIPTION

These functions return true (1) if arg is a NaN; otherwise they return false (0).  Neither function generates an exception, even when arg is a signaling NaN. 

SEE ALSO

fpgetround(3C)

CX/UX Programmer’s Reference Manual