On Tue, Jul 05, 2016 at 10:44:47AM +0200, Didier Kryn wrote: > Le 04/07/2016 19:25, Hendrik Boom a écrit : > >On Mon, Jul 04, 2016 at 06:32:38AM +0200, Didier Kryn wrote:
> >> Ada also. BTW, Ada is considered a descendant of Pascal, which is a > >>descendant of Algol68 :-) > >More a relative. Wirth made a proposal for a language, van Wijngaarden > >made a proposal for a defining formalism. Algol 68 was the result of > >merging the language ideas with the formalism, generalising wherever > >that worked, and imposing orthogonal design principles to simplify > >everytthing conceptually. > > > >Wirth was sufficienly upset with the result that he implemented a > >variant of his original design, quickly, acoiding whatever was tricky > >to implement, and called it Algol W. He made all caracter strings > >fixed-length (which ws diffeent from his original proposal. Later > >he made Pascal. I'd call Pascal a descendant of Algol W rather than of > >Algol 68. Pascal had an easier syntax to parse, simpler parameter > >passing conventions, and required array sizes to be statically > >determined, > > > >It ignored most of the new ideas introduced by Algol 68. > > > >> Ada is generally used when human life is at stake - planes, rockets, > >> air > >>traffic control, automatic vehicles. > >Ada resembled Pascal syntactically, but had very different semantics. > >For one thing, it was type-safe. Pascal wasn't. I'm not sure > >I'd really call it a descendant. > > > > > Cheers Hendrik. You know this history much better than me. I lived through most of it. To me, it was life. -- hendrik > > So let's say these languages share a few typical features: instructions > go across lines and they terminate with ';' (introduced by Algol60 I think), > they use ':=' for the assignment instruction, they use the same words to > denote basic types (Boolean, Integer, Natural), and they're wordy. And the now so-called Pascal-like languages sharply distinguish between expressions and statements. Statements cannot appear within expresssions. This is purely a syntactic restriction, because it's OK for an expression to call a procedure that contains statements. Algol 68 and OCaml has no such restriction. Modula 3 and Pascal do. -- hendrik _______________________________________________ Dng mailing list Dng@lists.dyne.org https://mailinglists.dyne.org/cgi-bin/mailman/listinfo/dng
