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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: Sun, 8 Sep 2024 11:27:33 +0100
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On 08/09/2024 09:58, Michael S wrote:
> On Sun, 8 Sep 2024 05:44:16 +0200
> Janis Papanagnou <janis_papanagnou+ng@hotmail.com> wrote:
> 
>> On 06.09.2024 13:34, Bart wrote:
>>>
>>> In more complicated cases in languages, then some asymmetry does
>>> come up. For example, suppose C allowed this (my language allows the
>>> equivalent):
>>>
>>>     (c ? a : b) = x;
>>
>> In Algol 68 you can write
>>
>>      IF c THEN a ELSE b FI := x
>>
>> or, in a shorter form, as
>>
>>      ( c | a | b ) := x
>>
>> if you prefer.
>>
> 
> Are you sure?
> It seems to me that you got it backward.
> 

The point here is that you can write such a 2-way select on the LHS of 
an assignment. C doesn't allow that unless you wrap it up as a pointer 
expression:

   *(c ? &a : &b) = x;

In language like C, the LHS of an assignment is one of four categories:

   A = Y;         // name
   *X = Y;        // pointer
   X[i] = Y;      // index
   X.m = Y;       // member select

A is a simple variable; X represents a term of any complexity, and Y is 
any expression. (In C, the middle two are really the same thing.)

Some languages allow extra things on the LHS, but in C they can be 
emulated by transforming the term to a pointer operation. In the same it 
can emulate pass-by-reference (which objects which are not arrays!)