Re: Top 10 most common hard skills listed on resumes...

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".

--
Ben.