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From: Bart <bc@freeuk.com>
Newsgroups: comp.lang.c
Subject: Re: Top 10 most common hard skills listed on resumes...
Date: Mon, 2 Sep 2024 23:48:19 +0100
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On 02/09/2024 23:31, Keith Thompson wrote:
> Bart <bc@freeuk.com> writes:
> [...]
>> But this is venturing away from the question of whether the left and
>> right sides of an assignment are compatible, or the same, or
>> symmetric.
>>
>> Obviously, one side is written to and the other is read; the RHS can
>> also contain a wider range of terms than the left side.
>>
>> But usually what can be legally on the left side on an assignment, can
>> also written on the right, and with the same syntax, and the same
>> levels of indirection.
> 
> Yes, but what can legally be on the right side of an assignment very
> often cannot be written on the left.  I don't call that "symmetric".

The symmetry is about when you /do/ legally have the same thing either 
side of '='. That is in contrast to BLISS where the RHS needs an 
explicit deref symbol, but the LHS doesn't.

BLISS, AFAIK, can also have unbalanced left and right expressions like:

   A = .B + .C + .D

which I believe is the point you're making above. Yet that was described 
as 'symmetric'.

Here's a more realistic example, negating a variable A:

    A  = -  A;            // C, described as 'asymmetric'
    A  = - .A;            // BLISS, described 'symmetric'