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29.\"     from: @(#)ieee.3	6.4 (Berkeley) 5/6/91
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31.Dd $Mdocdate: June 5 2013 $
32.Dt COPYSIGN 3
33.Os
34.Sh NAME
35.Nm copysign ,
36.Nm copysignf ,
37.Nm copysignl
38.Nd copy sign
39.Sh SYNOPSIS
40.In math.h
41.Ft double
42.Fn copysign "double x" "double y"
43.Ft float
44.Fn copysignf "float x" "float y"
45.Ft long double
46.Fn copysignl "long double x" "long double y"
47.Sh DESCRIPTION
48.Fn copysign
49returns
50.Fa x
51with its sign changed to
52.Fa y Ns 's.
53The
54.Fn copysignf
55function is a single precision version of
56.Fn copysign .
57The
58.Fn copysignl
59function is an extended precision version of
60.Fn copysign .
61.Sh SEE ALSO
62.Xr fabs 3
63.Sh STANDARDS
64.St -ieee754
65.Sh HISTORY
66The
67.Nm copysign ,
68.Nm copysignf
69and
70.Nm copysignl
71functions appeared in
72.Bx 4.3 ,
73.Nx 1.1
74and
75.Ox 4.5 ,
76respectively.
77