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=-1.9 required=5.0 tests=BAYES_00 autolearn=ham
	autolearn_force=no version=3.4.4
X-Google-Thread: 103376,c4cb2c432feebd9d
X-Google-Thread: 1094ba,c4cb2c432feebd9d
X-Google-Thread: 101deb,15c6ed4b761968e6
X-Google-Attributes: gid103376,gid1094ba,gid101deb,public
X-Google-Language: ENGLISH,ASCII-7-bit
Path: 
 g2news2.google.com!news1.google.com!news3.google.com!border1.nntp.dca.giganews.com!nntp.giganews.com!local01.nntp.dca.giganews.com!nntp.comcast.com!news.comcast.com.POSTED!not-for-mail
NNTP-Posting-Date: Thu, 25 May 2006 15:35:23 -0500
Date: Thu, 25 May 2006 13:35:47 -0700
From: glen herrmannsfeldt <gah@ugcs.caltech.edu>
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US;
 rv:1.4) Gecko/20030624 Netscape/7.1 (ax)
X-Accept-Language: en-us, en
MIME-Version: 1.0
Newsgroups: comp.lang.ada,comp.lang.fortran,comp.lang.pl1
Subject: Re: Checking for Undefined [was Re: Ada vs Fortran for scientific
 applications]
References: <mubcg.13522$fb2.853@newssvr27.news.prodigy.net>
 <epcs4e.qb8.ln@hunter.axlog.fr> <tHkcg.6937$kR6.484@trnddc05>
 <0ugu4e.4i7.ln@hunter.axlog.fr>
 <PkHcg.90575$Fs1.7198@bgtnsc05-news.ops.worldnet.att.net>
 <To_cg.10095$S7.4017@news-server.bigpond.net.au>
 <%P_cg.155733$eR6.26337@bgtnsc04-news.ops.worldnet.att.net>
 <6H9dg.10258$S7.9150@news-server.bigpond.net.au>
 <XVadg.76594$_S7.45873@newssvr14.news.prodigy.com>
 <1hfv5wb.1x4ab1tbdzk7eN%nospam@see.signature>
 <pan.2006.05.25.12.11.52.919554@linuxchip.demon.co.uk.uk.uk>
 <2006052509454116807-gsande@worldnetattnet> <4475DA0F.5030603@comcast.net>
 <2006052514574816807-gsande@worldnetattnet>
In-Reply-To: <2006052514574816807-gsande@worldnetattnet>
Content-Type: text/plain; charset=us-ascii; format=flowed
Content-Transfer-Encoding: 7bit
Message-ID: <RpudnczEQ5WWiOvZnZ2dnUVZ_sadnZ2d@comcast.com>
NNTP-Posting-Host: 24.18.174.4
X-Trace: 
 sv3-YT1W8FpdGs/8ZJ0z7JlnMsCIF8pgEF6l7dkrxSRK7sU27Jcz7mY2R1b8DcIHmapFBrTXhSl3pRssW4Z!wU9H+qzYKabqWPYDs4CfMukRlpAfSh8S950pi/kIGDpa9Mq40Q2IqdX72KbG4xCe9oOfkfeyQA6m!KDz2yw==
X-Complaints-To: abuse@comcast.net
X-DMCA-Complaints-To: dmca@comcast.net
X-Abuse-and-DMCA-Info: Please be sure to forward a copy of ALL headers
X-Abuse-and-DMCA-Info: Otherwise we will be unable to process your complaint
 properly
X-Postfilter: 1.3.32
Xref: g2news2.google.com comp.lang.ada:4472 comp.lang.fortran:10256
 comp.lang.pl1:1714
Date: 2006-05-25T13:35:47-07:00
List-Id: <comp.lang.ada>

Gordon Sande wrote:

(snip)

> I am getting the impression from the silence of the cross postings
> that undefined checking has only shown up in Fortran systems.
> The exception is Salford who also have it for their C but one also
> seems to notice that their C and Fortran seem to share a lot of features.

Java does compile time undefined value checking for scalar variables. 
If the compiler isn't convinced that a variable is defined before it is 
used, is it a fatal compilation error.  It might be compilers are 
getting better, but there are cases where I know a variable is always 
defined, but the compiler doesn't believe it.

-- glen