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From: jack@rlgvax.UUCP (Jack Waugh)
Newsgroups: net.lang
Subject: Logo Versions?
Message-ID: <1465@rlgvax.UUCP>
Date: Sat, 10-Dec-83 14:30:18 EST
Article-I.D.: rlgvax.1465
Posted: Sat Dec 10 14:30:18 1983
Date-Received: Sun, 11-Dec-83 02:35:28 EST
Organization: CCI Office Systems Group, Reston, VA
Lines: 19

Does anyone know about the different versions of the programming
language Logo?  As far as I can tell, there is no tendency toward
standardization.  I have learned the Apple Logo dialect well enough
to get the flavor of it.  Another version that got a better review
is Terrapin/Krell Logo.  Does anyone know if Tarrapin/Krell has the
"RUN" operator, which executes a list as a program, or the operators
that convert a list to a procedure (remembered as though the programmer
had entered it as "TO" whatever...) and vice versa?

For those that have never heard of Logo, it's a very interesting
language to which to expose first time computer programmers and
children.  I remember an article stating that children of age 5
had programmed in it.  Promotional literature from Apple claims
age 3.  Logo has LISP-style lists.  The programs, however, unlike
LISP programs, are not written out as lists, but in a prettier syntax.
Recursion, of course, is permissible.  Tail recursion does not push
the stack.  A call on a programmer-written procedure looks just like
an invocation of a primitive.  In at least the Apple dialect, programmers
can define control structures such as WHILE.