| The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1 | .\" Copyright (c) 1985, 1991 Regents of the University of California. |
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| 32 | .\" from: @(#)ieee.3 6.4 (Berkeley) 5/6/91 |
| 33 | .\" $FreeBSD: src/lib/msun/man/copysign.3,v 1.1 2005/01/27 05:46:16 das Exp $ |
| 34 | .\" |
| 35 | .Dd January 26, 2005 |
| 36 | .Dt COPYSIGN 3 |
| 37 | .Os |
| 38 | .Sh NAME |
| 39 | .Nm copysign , |
| 40 | .Nm copysignf , |
| 41 | .Nm copysignl |
| 42 | .Nd copy sign |
| 43 | .Sh LIBRARY |
| 44 | .Lb libm |
| 45 | .Sh SYNOPSIS |
| 46 | .In math.h |
| 47 | .Ft double |
| 48 | .Fn copysign "double x" "double y" |
| 49 | .Ft float |
| 50 | .Fn copysignf "float x" "float y" |
| 51 | .Ft long double |
| 52 | .Fn copysignl "long double x" "long double y" |
| 53 | .Sh DESCRIPTION |
| 54 | The |
| 55 | .Fn copysign , |
| 56 | .Fn copysignf |
| 57 | and |
| 58 | .Fn copysignl |
| 59 | functions |
| 60 | return |
| 61 | .Fa x |
| 62 | with its sign changed to |
| 63 | .Fa y Ns 's . |
| 64 | .Sh SEE ALSO |
| 65 | .Xr fabs 3 , |
| 66 | .Xr fdim 3 , |
| 67 | .Xr ieee 3 , |
| 68 | .Xr math 3 |
| 69 | .Sh STANDARDS |
| 70 | The |
| 71 | .Fn copysign , |
| 72 | .Fn copysignf , |
| 73 | and |
| 74 | .Fn copysignl |
| 75 | routines conform to |
| 76 | .St -isoC-99 . |
| 77 | They implement the Copysign function recommended by |
| 78 | .St -ieee754 . |
| 79 | .Sh HISTORY |
| 80 | The |
| 81 | .Fn copysign , |
| 82 | .Fn copysignf , |
| 83 | and |
| 84 | .Fn copysignl |
| 85 | functions appeared in |
| 86 | .Bx 4.3 , |
| 87 | .Fx 2.0 , |
| 88 | and |
| 89 | .Fx 5.3 , |
| 90 | respectively. |