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| .\" from: @(#)ieee.3 6.4 (Berkeley) 5/6/91 |
| .\" $FreeBSD: src/lib/msun/man/ieee_test.3,v 1.13 2005/11/17 13:00:00 ru Exp $ |
| .\" |
| .Dd November 6, 2005 |
| .Dt IEEE_TEST 3 |
| .Os |
| .Sh NAME |
| .Nm scalb , |
| .Nm scalbf , |
| .Nm significand , |
| .Nm significandf |
| .Nd IEEE test functions |
| .Sh LIBRARY |
| .Lb libm |
| .Sh SYNOPSIS |
| .In math.h |
| .Ft double |
| .Fn scalb "double x" "double n" |
| .Ft float |
| .Fn scalbf "float x" "float n" |
| .Ft double |
| .Fn significand "double x" |
| .Ft float |
| .Fn significandf "float x" |
| .Sh DESCRIPTION |
| These functions allow users to test conformance to |
| .St -ieee754 . |
| Their use is not otherwise recommended. |
| .Pp |
| .Fn scalb x n |
| and |
| .Fn scalbf x n |
| return |
| .Fa x Ns \(**(2** Ns Fa n ) |
| computed by exponent manipulation. |
| If |
| .Fa n |
| is not an integer, \*(Pm\*(If, or an \*(Na, the result is unspecified. |
| .Pp |
| .Fn significand x |
| and |
| .Fn significandf x |
| return |
| .Fa sig , |
| where |
| .Fa x |
| := |
| .Fa sig No \(** 2** Ns Fa n |
| with 1 \(<= |
| .Fa sig |
| < 2. |
| .Fn significand x |
| and |
| .Fn significandf x |
| are not defined when |
| .Fa x |
| is 0, \*(Pm\*(If, or \*(Na. |
| .Sh SEE ALSO |
| .Xr ieee 3 , |
| .Xr math 3 |
| .Sh STANDARDS |
| .St -ieee754 |