Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.compilers > #422

Re: programming in PL/I

Show all headers | View raw

Derek M. Jones <derek@_nospam_knosof.co.uk> wrote:

(snip, someone previously wrote)

>>> Is there a reason to prefer PL/I over C++ or Java?

(snip, someone else wrote)
>>  PL/I is more powerful than C,

> Since both are Turing complete languages how is PL/1 more powerful?

It seems to me that there are at least to ways to consider a language
powerful. One is that it lets you do many different things, the other
is that it allows them to be expressed easily.

This has at least some connection to compilers, so maybe not too
far off topic.

One PL/I feature that C doesn't have is array and structure expressions.

You can write:

   A = B + C;

for arrays or structures (or arrays of structures) in PL/I, but you
need loops, possibly nested loops, in C. (For structures, usually many
statements, as it isn't so easy to loop over a structure.)

Fortran now has array expressions, but still not structure expressions.

> Probably the major reason why people promote the benefits of any language.

(snip)

> [This is getting a bit far from compiler design.  PL/I suffers and
> benefits from being a kitchen sink language.  Cobol-style pictures
> are really handy if you're doing formatted numeric I/O, just
> strange otherwise. -John]

I do hope that sometimes language feature discussions, related to the
ability, or lack thereof, to implement them in a compiler would be on
topic.

I do remember Picture format and Picture variables, though maybe I
never tried them. I liked the idea of picture format, but thought that
picture variables were strange. I even remember that there were
Picture format options for British Pounds/Shillings/Pence, though
maybe not in newer compilers.

-- glen
[Those came straight from Cobol.  For what they're intended for, printing tidy
columns of numbers in reports, they work very well. -John]

Back to comp.compilers | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

Re: Parser generator drb@msu.edu (Dennis Boone) - 2012-01-08 11:47 -0600
  Re: Parser generator glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2012-01-08 21:58 +0000
    Re: Parser generator arnold@skeeve.com (Aharon Robbins) - 2012-01-11 20:06 +0000
      Re: PL/I, was Parser generator drb@ihatespam.msu.edu (Dennis Boone) - 2012-01-11 16:19 -0600
      Re: PL/I, was Parser generator Robert AH Prins <robert@prino.org> - 2012-01-11 23:42 +0000
      Re: programming in PL/I compilers@is-not-my.name - 2012-01-12 16:30 +0000
        Re: programming in PL/I Robert AH Prins <robert@prino.org> - 2012-01-14 09:20 +0000
        Re: programming in PL/I "Derek M. Jones" <derek@_NOSPAM_knosof.co.uk> - 2012-01-14 14:08 +0000
          Re: programming in PL/I glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2012-01-15 01:01 +0000
            Re: programming in PL/I glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2012-01-15 11:36 +0000
    Re: Parser generator for PL/I "robin" <robin51@dodo.com.au> - 2012-01-15 02:00 +1100
      Re: Parser generator for PL/I drb@ihatespam.msu.edu (Dennis Boone) - 2012-01-14 23:40 -0600
  Re: Parser generator SLK Systems <slkpg3@gmail.com> - 2012-01-08 20:26 -0500
    Re: Parser generator glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2012-01-11 07:22 +0000
      Re: Parser generator SLK Systems <slkpg3@gmail.com> - 2012-01-11 20:28 -0500

csiph-web