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From: Thiago Adams <thiago.adams@gmail.com>
Newsgroups: comp.lang.c
Subject: Re: integer divided by zero
Date: Fri, 25 Apr 2025 16:37:13 -0300
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Em 4/25/2025 2:50 PM, David Brown escreveu:
> On 25/04/2025 19:38, Thiago Adams wrote:
>> Does anyone know of any platform where integer division by zero 
>> returns a number, or in other words, where it's not treated as an 
>> error? I'm asking because division by zero is undefined behaviour, but 
>> I think division by a constant zero should be a constraint instead.
>>
> 
> Some processors might give a specific value for their integer division 
> instructions for divide by 0 - or they might support masking of relevant 
> traps, exceptions or other fault mechanisms.  Software should probably 
> not rely on division by 0 behaviour, even if it is in non-portable code.
> 
> But most processors that are too small to have a fault, trap or 
> exception system are also too small to have division instructions. There 
> are exceptions, of course.
> 
> Division by a constant 0 is not a constraint in C because that would 
> require compilers to detect division by zero.  

This is easy for constant.

But conforming compilers
> are free to detect it anyway, and issue a warning.  Note that compilers 
> should probably not consider it a fatal error in the code (i.e., one 
> that stops the compilation) unless the compiler can be sure that the 
> code in question is not executed.  There is no problem having undefined 
> behaviour in the code until you try to execute that code path.
> 

Since 1/0 is not a constant, then if 1/0 were a constrain, the 
programmer could use a variable instead.

static int zero = 0;
1/zero //ok