2005-01-27 05:46:17 +00:00
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.\" Copyright (c) 1985, 1991 Regents of the University of California.
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.\" All rights reserved.
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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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2017-02-28 23:42:47 +00:00
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.\" 3. Neither the name of the University nor the names of its contributors
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2005-01-27 05:46:17 +00:00
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.\" without specific prior written permission.
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.\" SUCH DAMAGE.
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.\"
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.\" from: @(#)ieee.3 6.4 (Berkeley) 5/6/91
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.\" $FreeBSD$
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.\"
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.Dd January 26, 2005
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.Dt COPYSIGN 3
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.Os
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.Sh NAME
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.Nm copysign ,
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.Nm copysignf ,
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.Nm copysignl
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.Nd copy sign
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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 copysign "double x" "double y"
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.Ft float
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.Fn copysignf "float x" "float y"
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.Ft long double
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.Fn copysignl "long double x" "long double y"
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.Sh DESCRIPTION
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The
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.Fn copysign ,
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.Fn copysignf
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and
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.Fn copysignl
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functions
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return
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.Fa x
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with its sign changed to
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.Fa y Ns 's .
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.Sh SEE ALSO
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.Xr fabs 3 ,
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.Xr fdim 3 ,
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.Xr ieee 3 ,
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.Xr math 3
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.Sh STANDARDS
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The
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.Fn copysign ,
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.Fn copysignf ,
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and
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.Fn copysignl
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routines conform to
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.St -isoC-99 .
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They implement the Copysign function recommended by
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.St -ieee754 .
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.Sh HISTORY
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The
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.Fn copysign ,
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.Fn copysignf ,
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and
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.Fn copysignl
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functions appeared in
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.Bx 4.3 ,
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.Fx 2.0 ,
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and
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.Fx 5.3 ,
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respectively.
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