| The Android Open Source Project | a27d2ba | 2008-10-21 07:00:00 -0700 | [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/ieee_test.3,v 1.13 2005/11/17 13:00:00 ru Exp $ |
| 34 | .\" |
| 35 | .Dd November 6, 2005 |
| 36 | .Dt IEEE_TEST 3 |
| 37 | .Os |
| 38 | .Sh NAME |
| 39 | .Nm scalb , |
| 40 | .Nm scalbf , |
| 41 | .Nm significand , |
| 42 | .Nm significandf |
| 43 | .Nd IEEE test functions |
| 44 | .Sh LIBRARY |
| 45 | .Lb libm |
| 46 | .Sh SYNOPSIS |
| 47 | .In math.h |
| 48 | .Ft double |
| 49 | .Fn scalb "double x" "double n" |
| 50 | .Ft float |
| 51 | .Fn scalbf "float x" "float n" |
| 52 | .Ft double |
| 53 | .Fn significand "double x" |
| 54 | .Ft float |
| 55 | .Fn significandf "float x" |
| 56 | .Sh DESCRIPTION |
| 57 | These functions allow users to test conformance to |
| 58 | .St -ieee754 . |
| 59 | Their use is not otherwise recommended. |
| 60 | .Pp |
| 61 | .Fn scalb x n |
| 62 | and |
| 63 | .Fn scalbf x n |
| 64 | return |
| 65 | .Fa x Ns \(**(2** Ns Fa n ) |
| 66 | computed by exponent manipulation. |
| 67 | If |
| 68 | .Fa n |
| 69 | is not an integer, \*(Pm\*(If, or an \*(Na, the result is unspecified. |
| 70 | .Pp |
| 71 | .Fn significand x |
| 72 | and |
| 73 | .Fn significandf x |
| 74 | return |
| 75 | .Fa sig , |
| 76 | where |
| 77 | .Fa x |
| 78 | := |
| 79 | .Fa sig No \(** 2** Ns Fa n |
| 80 | with 1 \(<= |
| 81 | .Fa sig |
| 82 | < 2. |
| 83 | .Fn significand x |
| 84 | and |
| 85 | .Fn significandf x |
| 86 | are not defined when |
| 87 | .Fa x |
| 88 | is 0, \*(Pm\*(If, or \*(Na. |
| 89 | .Sh SEE ALSO |
| 90 | .Xr ieee 3 , |
| 91 | .Xr math 3 |
| 92 | .Sh STANDARDS |
| 93 | .St -ieee754 |