minix/lib/libm/man/isinff.3

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.\" $NetBSD: isinff.3,v 1.6 2010/05/14 03:10:24 joerg Exp $
.\"
.\" Copyright (c) 1991, 1993
.\" The Regents of the University of California. All rights reserved.
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.\" 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.