77 lines
2.4 KiB
Groff
77 lines
2.4 KiB
Groff
.\" $NetBSD: isinff.3,v 1.5 2003/08/07 16:44:48 agc Exp $
|
|
.\"
|
|
.\" Copyright (c) 1991, 1993
|
|
.\" The Regents of the University of California. All rights reserved.
|
|
.\"
|
|
.\" 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. 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.
|
|
.\"
|
|
.\" from: @(#)isinf.3 8.2 (Berkeley) 1/29/94
|
|
.\" from: NetBSD: isinf.3,v 1.5 1998/08/02 04:52:54 mycroft Exp
|
|
.\"
|
|
.Dd August 16, 1999
|
|
.Dt ISINFF 3
|
|
.Os
|
|
.Sh NAME
|
|
.Nm isinff ,
|
|
.Nm isnanf
|
|
.Nd test for infinity or not-a-number
|
|
.Sh LIBRARY
|
|
.Lb libm
|
|
.Sh SYNOPSIS
|
|
.In math.h
|
|
.Ft int
|
|
.Fn isinff float
|
|
.Ft int
|
|
.Fn isnanf float
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Fn isinff
|
|
function
|
|
returns 1 if the number is
|
|
.Dq \\*(If ,
|
|
otherwise 0.
|
|
.Pp
|
|
The
|
|
.Fn isnanf
|
|
function
|
|
returns 1 if the number is
|
|
.Dq not-a-number ,
|
|
otherwise 0.
|
|
.Sh SEE ALSO
|
|
.Xr isinf 3 ,
|
|
.Xr isnan 3 ,
|
|
.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.
|