OSF

NAME

isnan −  Tests for NaN (Not a Number)

LIBRARY

Math Library (libm.a)

SYNOPSIS

#include <math.h> int isnan (
double x );

PARAMETERS

xSpecifies a double value. 

DESCRIPTION

The isnan() function tests whether x is NaN (Not a Number). 

NOTES

AES Support Level:
Trial use

RETURN VALUES

The isnan() function returns a nonzero value if x is NaN.  Otherwise, 0 (zero) is returned.