isnan(3C)                                               isnan(3C)



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 excep-
     tion, even when arg is a signaling NaN.

SEE ALSO
     fpgetround(3C)






























Page 1                        CX/UX Programmer's Reference Manual