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From: Keith Thompson <kst-u@mib.org>
Newsgroups: comp.lang.c
Subject: Re: A glitch regarding the usual malloc() idiom
Date: Thu, 04 Aug 2016 14:02:18 -0700
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John Bode <jfbode1029@gmail.com> writes:
[...]
> With the sole exception of VLAs, sizeof doesn't evaluate its operand
> *at all*:  
>
>     sizeof a[i] 
>
> does not perform the subscript operation;
>
>     sizeof a+b
>
> does not perform the addition;
>
>     sizeof a&&b 
>
> does not perform the logical AND operation.

Perhaps a more striking example:

    sizeof printf("hello, world\n")

doesn't print anything.  It's equivalent to `sizeof (int)`, since
int is printf's return type.

[...]

-- 
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"