2002-02-07 10:00:09 +03:00
|
|
|
.\" $NetBSD: isinf.3,v 1.8 2002/02/07 07:00:15 ross Exp $
|
1995-02-27 07:34:47 +03:00
|
|
|
.\"
|
|
|
|
|
.\" Copyright (c) 1991, 1993
|
|
|
|
|
.\" The Regents of the University of California. All rights reserved.
|
1993-03-21 12:45:37 +03:00
|
|
|
.\"
|
|
|
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
|
|
|
.\" modification, are permitted provided that the following conditions
|
|
|
|
|
.\" are met:
|
|
|
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
|
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
|
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
|
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
|
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
|
|
|
.\" 3. All advertising materials mentioning features or use of this software
|
|
|
|
|
.\" must display the following acknowledgement:
|
|
|
|
|
.\" This product includes software developed by the University of
|
|
|
|
|
.\" California, Berkeley and its contributors.
|
|
|
|
|
.\" 4. Neither the name of the University nor the names of its contributors
|
|
|
|
|
.\" may be used to endorse or promote products derived from this software
|
|
|
|
|
.\" without specific prior written permission.
|
|
|
|
|
.\"
|
|
|
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
|
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
|
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
|
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
|
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
|
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
|
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
|
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
|
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
|
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
|
|
|
.\" SUCH DAMAGE.
|
|
|
|
|
.\"
|
1995-02-27 07:34:47 +03:00
|
|
|
.\" @(#)isinf.3 8.2 (Berkeley) 1/29/94
|
1993-03-21 12:45:37 +03:00
|
|
|
.\"
|
1995-02-27 07:34:47 +03:00
|
|
|
.Dd January 29, 1994
|
1993-03-21 12:45:37 +03:00
|
|
|
.Dt ISINF 3
|
|
|
|
|
.Os
|
|
|
|
|
.Sh NAME
|
|
|
|
|
.Nm isinf ,
|
|
|
|
|
.Nm isnan
|
1995-02-27 07:34:47 +03:00
|
|
|
.Nd test for infinity or not-a-number
|
1998-02-05 21:45:17 +03:00
|
|
|
.Sh LIBRARY
|
|
|
|
|
.Lb libc
|
1993-03-21 12:45:37 +03:00
|
|
|
.Sh SYNOPSIS
|
2002-02-07 10:00:09 +03:00
|
|
|
.Fd #include \*[Lt]math.h\*[Gt]
|
2001-09-16 06:30:23 +04:00
|
|
|
.Ft int
|
1993-03-21 12:45:37 +03:00
|
|
|
.Fn isinf double
|
2001-09-16 06:30:23 +04:00
|
|
|
.Ft int
|
1993-03-21 12:45:37 +03:00
|
|
|
.Fn isnan double
|
|
|
|
|
.Sh DESCRIPTION
|
|
|
|
|
The
|
1998-08-02 08:52:54 +04:00
|
|
|
.Fn isinf
|
1993-03-21 12:45:37 +03:00
|
|
|
function
|
|
|
|
|
returns 1 if the number is
|
|
|
|
|
.Dq \\*(If ,
|
|
|
|
|
otherwise 0.
|
|
|
|
|
.Pp
|
|
|
|
|
The
|
|
|
|
|
.Fn isnan
|
|
|
|
|
function
|
|
|
|
|
returns 1 if the number is
|
1995-02-27 07:34:47 +03:00
|
|
|
.Dq not-a-number ,
|
1993-03-21 12:45:37 +03:00
|
|
|
otherwise 0.
|
|
|
|
|
.Sh SEE ALSO
|
1999-08-17 03:12:19 +04:00
|
|
|
.Xr isinff 3 ,
|
|
|
|
|
.Xr isnanf 3 ,
|
1993-03-21 12:45:37 +03:00
|
|
|
.Xr math 3
|
|
|
|
|
.Rs
|
|
|
|
|
.%T "IEEE Standard for Binary Floating-Point Arithmetic"
|
|
|
|
|
.%Q ANSI
|
|
|
|
|
.%R Std 754-1985
|
|
|
|
|
.Re
|
|
|
|
|
.Sh BUGS
|
|
|
|
|
Neither the
|
|
|
|
|
.Tn VAX
|
|
|
|
|
nor the Tahoe floating point have distinguished values
|
|
|
|
|
for either infinity or not-a-number.
|
|
|
|
|
These routines always return 0 on those architectures.
|
