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From: Keith Thompson <kst-u@mib.org>
Newsgroups: comp.lang.c
Subject: Re: for-loop scopes
Date: Thu, 23 Mar 2017 08:37:27 -0700
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BartC <bc@freeuk.com> writes:
> This line in the 'struct padding' thread:
>
>      for(long i = 0; i<N; i++)
>
> prompted me to do more tests:
>
>    {
>      double i;                 // scope 1
>      for (int i=0; i<10; ++i)  // scope 2
>          i;                    // scope 2
>          i;                    // scope 1, deliberate misalignment
>
> Is is correct that the 'int i' inside the for-loop header creates a new 
> scope for the following single statement, even without the existence of 
> a formal {...} block?

Did you try looking it up in the standard before posting?  Why not?

> I'm just asking because I'm finding it hard to believe that those last 
> two final 'i' terms switch types with merely an intervening ';'.

If your code layout is deliberately misleading, it's going to lead to
surprises.  Not all scopes are delimited by curly braces.

-- 
Keith Thompson (The_Other_Keith) kst-u@mib.org  <http://www.ghoti.net/~kst>
Working, but not speaking, for JetHead Development, Inc.
"We must do something.  This is something.  Therefore, we must do this."
    -- Antony Jay and Jonathan Lynn, "Yes Minister"