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=3.0 required=5.0 tests=BAYES_00,FROM_WORDY,
	PP_MIME_FAKE_ASCII_TEXT,REPLYTO_WITHOUT_TO_CC autolearn=no
	autolearn_force=no version=3.4.4
X-Google-Thread: 103376,f822ae7b0f7433c1
X-Google-Attributes: gid103376,public
X-Google-Language: ENGLISH,ASCII
Path: 
 g2news2.google.com!news4.google.com!news3.google.com!border1.nntp.dca.giganews.com!nntp.giganews.com!local01.nntp.dca.giganews.com!nntp.rcn.net!news.rcn.net.POSTED!not-for-mail
NNTP-Posting-Date: Tue, 16 Jan 2007 11:20:32 -0600
Reply-To: "Frank J. Lhota" <FrankLho.NOSPAM@rcn.com>
From: "Frank J. Lhota" <FrankLho.NOSPAM@rcn.com>
Newsgroups: comp.lang.ada
References: <1168871816.263502.212100@11g2000cwr.googlegroups.com>
   <mailman.22.1168919455.18371.comp.lang.ada@ada-france.org>
   <45ace573$1_3@news.bluewin.ch>   <68qioe.mes.ln@hunter.axlog.fr>
 <1168963927.396654.169380@s34g2000cwa.googlegroups.com>
 <eoj0u8$148$1@aioe.org>
Subject: Re: Translating an embedded C algorithm
Date: Tue, 16 Jan 2007 12:20:32 -0500
X-Priority: 3
X-MSMail-Priority: Normal
X-Newsreader: Microsoft Outlook Express 6.00.2900.3028
X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3028
X-RFC2646: Format=Flowed; Response
Message-ID: <J5WdnYWom9j9lDDYnZ2dnUVZ_qyjnZ2d@rcn.net>
NNTP-Posting-Host: 209.6.187.224
X-Trace: 
 sv3-SagTuOUu4RQuXAQqGg1tvPToewzHYer1uBb9e1Hb++B8sc3T2hhbCX8PGODeSDdpm5NXl02G7XSrey8!tPRwHI1PxG0LqWQtNT89bt/UxiOiX3p2OVpPqwrgeKvZq7KgybL+eBP+6E0BOacnCR3fbUWX87RU!8Q==
X-Complaints-To: abuse@rcn.net
X-DMCA-Complaints-To: abuse@rcn.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:8185
Date: 2007-01-16T12:20:32-05:00
List-Id: <comp.lang.ada>

"Cesar Rabak" <csrabak@yahoo.com.br> wrote in message 
news:eoj0u8$148$1@aioe.org...
> Ludovic Brenta escreveu:
>> Jean-Pierre Rosen a �crit :
>>>> A question: I see all the time things like "if (.. < ..)" in C - are 
>>>> the
>>>> parentheses required there ?
>>> Yes, they are - because C has no "then" keyword. There must be something
>>> to tell the compiler where the expression ends...
>>
>> Not to mention that the parentheses may contain several expressions
>> separated by the comma operator, some or all of which may have side
>> effects, and only the last of which actually controls the if
>> statement... for example:
>>
>> if (a = 1, b = a, c = --a, (a = --b) == c) {
>>    ...
>> }
>>
>> Ah, the joy of obfuscated programming :) :) :)
>>
> Would you believe that:
>
> if (a = 1) {
>     ...
> }
>
> Is semantically valid C, but because it is very easy to mistake this when 
> the intended was:
>
> if (a == 1) {
>     ...
> }
>
> That there are tools to look for and signal this!?

A lot of C compiler will warn you about constructs such as

    if (a=1) {
        ...
    }