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From: Vir Campestris <vir.campestris@invalid.invalid>
Newsgroups: comp.lang.c
Subject: Re: how cast works?
Date: Mon, 12 Aug 2024 11:51:34 +0100
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On 12/08/2024 01:43, Tim Rentsch wrote:
> Thiago Adams <thiago.adams@gmail.com> writes:
> 
>> I also would like to understand better why integer promotions were created.
>>
>> My guess..it is because the values are used in registers and there is
>> no "char" size register so the values are converted in a bigger type.
>> Is my guess correct?
> 
> The motivations for integer promotion rules are purely historical.
> You're looking for answers in the wrong places.
> 
> Also, it would be better for your understanding of C if you would
> stop thinking about what is going on at the level of actual
> hardware.  Doing that serves to confuse a lot more than it helps.

I think I feel my ears burning!

Thiago, an example - if I have two integers, and I want to multiply 
them, the output  may be too big to fit in an integer. Cast them both to 
a size twice as big, multiply them, and you know the output will fit. 
You can then check it will fit back into an int.

Andy
-- 

Being careful of course because there's no guarantee than long is bigger 
than int...