minix/lib/libm/man/copysign.3
Lionel Sambuc 84d9c625bf Synchronize on NetBSD-CVS (2013/12/1 12:00:00 UTC)
- Fix for possible unset uid/gid in toproto
 - Fix for default mtree style
 - Update libelf
 - Importing libexecinfo
 - Resynchronize GCC, mpc, gmp, mpfr
 - build.sh: Replace params with show-params.
     This has been done as the make target has been renamed in the same
     way, while a new target named params has been added. This new
     target generates a file containing all the parameters, instead of
     printing it on the console.
 - Update test48 with new etc/services (Fix by Ben Gras <ben@minix3.org)
     get getservbyport() out of the inner loop

Change-Id: Ie6ad5226fa2621ff9f0dee8782ea48f9443d2091
2014-07-28 17:05:06 +02:00

90 lines
2.6 KiB
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.\" $NetBSD: copysign.3,v 1.1 2011/04/13 04:57:10 jruoho Exp $
.\"
.\" Copyright (c) 2011 Jukka Ruohonen <jruohonen@iki.fi>
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
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.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.Dd April 13, 2011
.Dt COPYSIGN 3
.Os
.Sh NAME
.Nm copysign ,
.Nm copysignf ,
.Nm copysignl
.Nd functions to manipulate signs
.Sh LIBRARY
.Lb libm
.Sh SYNOPSIS
.In math.h
.Ft double
.Fn copysign "double x" "double y"
.Ft float
.Fn copysignf "float x" "float y"
.Ft long double
.Fn copysignl "long double x" "long double y"
.Sh DESCRIPTION
The
.Fn copysign ,
.Fn copysignf ,
and
.Fn copysignl
functions return a value whose absolute value matches
.Fa x ,
but whose sign bit is taken from
.Fa y .
.Sh RETURN VALUES
Upon successful completion,
all three functions return a value with the magnitude of
.Fa x
and the sign of
.Fa y .
If
.Fa x
is
\*(Na ,
the functions return a
\*(Na
with the sign of
.Fa y .
.Sh SEE ALSO
.Xr math 3 ,
.Xr signbit 3
.Sh STANDARDS
The described functions conform to
.St -isoC-99 .
.\"
.\" XXX: Verify this.
.\"
.\" The functions are also recommended by
.\" .St -ieee754
.\"
.\" .Sh HISTORY
.\"
.\" XXX: Fill this.
.\"
.\" These functions first appeared in ???.
.\"
.Sh CAVEATS
Note that on implementations that represent a signed zero
but do not treat negative zero consistently in arithmetic operations,
these functions may regard the sign of zero as positive.