2013-12-06 12:04:52 +01:00
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.\" $NetBSD: nan.3,v 1.4 2011/06/10 14:10:18 njoly Exp $
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2011-03-18 16:52:16 +01:00
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.\"
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.\" Copyright (c) 2006 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to The NetBSD Foundation
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.\" by Klaus Klein.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd March 15, 2006
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.Dt NAN 3
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.Os
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.Sh NAME
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.Nm nan ,
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.Nm nanf ,
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.Nm nanl
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.Nd return quiet NaN
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.Sh LIBRARY
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.Lb libm
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.Sh SYNOPSIS
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.In math.h
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.Ft double
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.Fn nan "const char *tagp"
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.Ft float
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.Fn nanf "const char *tagp"
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.Ft long double
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.Fn nanl "const char *tagp"
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.Sh DESCRIPTION
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The call
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.Fn nan "\*qn-char-sequence\*q"
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is equivalent to the call
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.Fn strod "\*qNAN(n-char-sequence)\*q" "NULL" .
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The call
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.Fn nan "\*q\*q"
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is equivalent to the call
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.Fn strod "\*qNAN()\*q" "NULL" .
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.Pp
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The
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.Fn nanf
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and
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.Fn nanl
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functions are equivalent to
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.Fn nan
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but substituting
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.Fn strtof
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and
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2013-12-06 12:04:52 +01:00
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.Fn strtold ,
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2011-03-18 16:52:16 +01:00
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respectively.
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.Sh RETURN VALUES
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.Ss IEEE 754
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The
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.Fn nan ,
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.Fn nanf ,
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and
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.Fn nanl
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functions return a quiet NaN as specified by
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.Fa tagp .
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.Ss VAX
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The
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.Fn nan ,
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.Fn nanf ,
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and
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.Fn nanl
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functions return zero.
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.Sh SEE ALSO
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.Xr math 3 ,
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.Xr strtod 3
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.Sh STANDARDS
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The
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.Fn nan ,
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.Fn nanf ,
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and
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.Fn nanl
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functions conform to
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.St -isoC-99 .
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