Re: longint and/or overflow bug?

From	Marco van de Voort <marcov@toad.stack.nl>
Newsgroups	comp.lang.pascal.borland
Subject	Re: longint and/or overflow bug?
Date	2012-10-31 10:11 +0000
Organization	Stack Usenet News Service
Message-ID	<slrnk91ub5.1j6f.marcov@toad.stack.nl> (permalink)
References	<a3cac83f-4bb6-46ae-a9ab-70a7c0d73e5d@s18g2000yqh.googlegroups.com> <slrnk91s66.1ddn.marcov@toad.stack.nl>

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On 2012-10-31, Marco van de Voort <marcov@toad.stack.nl> wrote:
> On 2012-10-30, Jim Leonard <mobygamer@gmail.com> wrote:
>>
>> var
>>   l:longint;
>>   w1,w2:word;
>>
>> begin
>>   w1:=val1; w2:=val2;
>>   l:=w1 * w2; {Throws runtime 215 "arithmetic overflow" if $Q+}
>
> typing:
> longint :=word * word

> Pascal rule is afaik that an expression is evaluated in (at least?) the
> combined range of the operands.  Which is word.

Hmm, thinking of it, in Pascal the above is impossible, since range(word)
is not a subset of range(integer). Those are special yet again.

Still the behaviour is normal and consistent in the Borland lines and
compatibles.

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Thread

longint and/or overflow bug? Jim Leonard <mobygamer@gmail.com> - 2012-10-30 08:56 -0700
  Re: longint and/or overflow bug? Vinzent Höfler <0439279208b62c95f1880bf0f8776eeb@t-domaingrabbing.de> - 2012-10-30 18:18 +0100
    Re: longint and/or overflow bug? Jim Leonard <mobygamer@gmail.com> - 2012-10-30 12:31 -0700
      Re: longint and/or overflow bug? rugxulo@gmail.com - 2012-10-30 14:50 -0700
  Re: longint and/or overflow bug? Marco van de Voort <marcov@toad.stack.nl> - 2012-10-31 09:35 +0000
    Re: longint and/or overflow bug? Marco van de Voort <marcov@toad.stack.nl> - 2012-10-31 10:11 +0000

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