isnan.c

<B>Digital的Unix操作系统VAX 4.2源码</B>

/*	@(#)isnan.c	4.1	(ULTRIX)	7/3/90 */

/************************************************************************
 *									*
 *			Copyright (c) 1989 by				*
 *		Digital Equipment Corporation, Maynard, MA		*
 *			All rights reserved.				*
 *									*
 *   This software is furnished under a license and may be used and	*
 *   copied  only  in accordance with the terms of such license and	*
 *   with the  inclusion  of  the  above  copyright  notice.   This	*
 *   software  or  any  other copies thereof may not be provided or	*
 *   otherwise made available to any other person.  No title to and	*
 *   ownership of the software is hereby transferred.			*
 *									*
 *   The information in this software is subject to change  without	*
 *   notice  and should not be construed as a commitment by Digital	*
 *   Equipment Corporation.						*
 *									*
 *   Digital assumes no responsibility for the use  or  reliability	*
 *   of its software on equipment which is not supplied by Digital.	*
 *									*
 ************************************************************************/

/************************************************************************
 *
 *		Modification History
 *
 * 0001	Jon Reeves, 1989 July 10
 *	Added for X/Open compatibility
 *
 ************************************************************************/

/* isnan - return 1 if value is NaN */

#include	<ieeefp.h>

int
isnan(x)
double x;
{
	if (isnand(x))
		return 1;
	else
		return 0;
}