From mboxrd@z Thu Jan  1 00:00:00 1970
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me
X-Spam-Level: 
X-Spam-Status: No, score=-0.3 required=5.0 tests=BAYES_00,
	REPLYTO_WITHOUT_TO_CC autolearn=no autolearn_force=no version=3.4.4
X-Google-Thread: 103376,ac6f692d19115ce0
X-Google-Attributes: gid103376,public
X-Google-Language: ENGLISH,ASCII-7-bit
Path: 
 g2news1.google.com!news4.google.com!news.glorb.com!npeer.de.kpn-eurorings.net!newsfeed.arcor.de!news.arcor.de!not-for-mail
From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: Exponent floats?
Newsgroups: comp.lang.ada
User-Agent: 40tude_Dialog/2.0.14.1
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
Reply-To: mailbox@dmitry-kazakov.de
Organization: cbb software GmbH
References: <E1M1e.19923$wL6.12523@trnddc03>
Date: Mon, 28 Mar 2005 08:49:28 +0200
Message-ID: <18pr9vfqxcnbs.3a905du0c170.dlg@40tude.net>
NNTP-Posting-Date: 28 Mar 2005 08:49:18 MEST
NNTP-Posting-Host: fec19f94.newsread4.arcor-online.net
X-Trace: 
 DXC=od\VAWLQ[EW8f4>W>BJ_OP:ejgIfPPldTjW\KbG]kaMXFYk:AnJB[C]a88JDYEXBLP[6LHn;2LCV^COgUkn_?_Y_LUEPKAmD8U\
X-Complaints-To: abuse@arcor.de
Xref: g2news1.google.com comp.lang.ada:10058
Date: 2005-03-28T08:49:18+02:00
List-Id: <comp.lang.ada>

On Mon, 28 Mar 2005 04:49:40 GMT, Puckdropper wrote:

> I have an algorithm that requires a floating point exponent.  How can I 
> use such a thing?  I tried using **, but it gives me 3 errors:
> 
> test.adb:12:24: invalid operand types for operator "**"
> test.adb:12:24: left operand has type "Standard.float"
> test.adb:12:24: right operand has type "Standard.float"
> 
> To demonstrate my problem, I wrote a short program:
> 
> -----------------------------
> 
> with Ada.Text_IO, Ada.Float_Text_IO;

with Ada.Numerics.Elementary_Functions;
use  Ada.Numerics.Elementary_Functions;

> procedure test is
> 
> expon: float;
> Answer: float;
> Base: float;
> 
> begin -- Main Program
> 	expon := 2.0;
> 	Base := 2.0;
> 	Answer := base ** expon;

Answer := exp (log (base) * expon);

> 	Ada.Float_Text_IO.put(Answer);
> 	Ada.Text_IO.new_line;
> end test;

("**" is predefined for only integer powers, see ARM 4.5.6)

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de