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From: Keith Thompson <Keith.S.Thompson+u@gmail.com>
Newsgroups: comp.lang.c
Subject: Re: Top 10 most common hard skills listed on resumes...
Date: Tue, 27 Aug 2024 12:22:09 -0700
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Ben Bacarisse <ben@bsb.me.uk> writes:
> Keith Thompson <Keith.S.Thompson+u@gmail.com> writes:
>> Ben Bacarisse <ben@bsb.me.uk> writes:
>>> Bart <bc@freeuk.com> writes:
>>>> BLISS is a rather strange language. For something supposedly low level than
>>>> C, it doesn't have 'goto'.
>>>>
>>>> It is also typeless.
>>>>
>>>> There is also a key feature that sets it apart from most HLLs: usually if
>>>> you declare a variable A, then you can access A's value just by writing A;
>>>> its address is automatically dereferenced.
>>>
>>> Not always.  This is where left- and right-evaluation came in.  On the
>>> left of an assignment A denotes a "place" to receive a value.  On the
>>> right, it denotes a value obtained from a place.  CPL used the terms and
>>> C got them via BCPL's documentation.  Viewed like this, BLISS just makes
>>> "evaluation" a universal concept.
>>
>> As I recall, the terms "lvalue" and "rvalue" originated with CPL.  The
>> 'l' and 'r' suggest the left and right sides of an assignment.
>>
>> Disclaimer: I have a couple of CPL documents, and I don't see the terms
>> "lvalue" and "rvalue" in a quick look.  The PDFs are not searchable.  If
>> someone has better information, please post it.  Wikipedia does say that
>> the notion of "l-values" and "r-values" was introduced by CPL.
>
> I presume, since I mentioned the concepts coming from CPL, you are
> referring to specifically the short-form terms l- and r-values?
>
> I can't help with those specific terms as the document I have uses a
> mixture of terms like "the LH value of...", "left-hand expressions" and
> "evaluated in LH mode".

The documents I have are unsearchable PDFs; they appear to be scans of
paper documents.

https://comjnl.oxfordjournals.org/content/6/2/134.full.pdf
https://www.ancientgeek.org.uk/CPL/CPL_Elementary_Programming_Manual.pdf

Do you have friendlier documents?

-- 
Keith Thompson (The_Other_Keith) Keith.S.Thompson+u@gmail.com
void Void(void) { Void(); } /* The recursive call of the void */