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Algol 68 - formatting with fixed point format

From Janis Papanagnou <janis_papanagnou+ng@hotmail.com>
Newsgroups comp.lang.misc
Subject Algol 68 - formatting with fixed point format
Date 2025-08-23 06:49 +0200
Organization A noiseless patient Spider
Message-ID <108bh8a$1vgqm$1@dont-email.me> (permalink)

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One of the things I don't find too easy to get into in Algol 68 is the
formatted I/O with the FORMAT objects and its own formatting language.
Meanwhile I solved all the initial obstacles... - All obstacles? - No.
There's a "simple" one left (simple in "C") where I'm still clueless!

This (probably profane) question is best described with the 'printf'
equivalent from Kornshell (not quite the behavior of /usr/bin/printf)

  $ printf "v=%.1f m/s\n" .45 12.35
  v=0.5 m/s
  v=12.4 m/s

i.e. it shall have the properties
 *  one digit after the decimal point (rounding excess digits)
 *  one leading 0 before decimal point (for  -1 < value < +1 )
 *  minimum required space (no blanks or other padding)

In Algol 68 I'd have to negate the first parameter of g(), but -0
doesn't work (it's considered positive) and any number like -5 would
pad the data (or create the error pattern if the number doesn't fit)

  $ genie -x 'printf (($ "v=" g(-0,+1) " m/s" l $, .45, 12.35))'
  v=.5 m/s
  v=12.3 m/s
  $ genie -x 'printf (($ "v=" g(-5,+1) " m/s" l $, .45, 12.35))'
  v=  0.5 m/s
  v= 12.3 m/s

Where's the trick, what am I missing?

It's (currently) not "critical", I can go with the "ugly" results of
g(-5,+1), but I'm curious whether this case is impossible to formulate
(which I doubt), or whether it's yet just hidden from my mind.

Janis

PS: I don't want to work around that problem (be it string processing,
or by using Genie's (non-standard) feature of using "C" formatting).

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Algol 68 - formatting with fixed point format Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-08-23 06:49 +0200
  Re: Algol 68 - formatting with fixed point format Andy Walker <anw@cuboid.co.uk> - 2025-08-23 15:22 +0100
    Re: Algol 68 - formatting with fixed point format Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-08-23 17:49 +0200
      Re: Algol 68 - formatting with fixed point format Andy Walker <anw@cuboid.co.uk> - 2025-08-24 00:58 +0100
        Re: Algol 68 - formatting with fixed point format Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-08-25 01:49 +0200
          Re: Algol 68 - formatting with fixed point format Andy Walker <anw@cuboid.co.uk> - 2025-08-26 23:53 +0100
    Re: Algol 68 - formatting with fixed point format Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-08-23 19:28 +0200
      Re: Algol 68 - formatting with fixed point format Andy Walker <anw@cuboid.co.uk> - 2025-08-24 00:27 +0100
        Re: Algol 68 - formatting with fixed point format Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-08-24 02:49 +0000
          Re: Algol 68 - formatting with fixed point format Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-08-25 01:57 +0200
        Re: Algol 68 - formatting with fixed point format Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-08-25 02:14 +0200
          Re: Algol 68 - formatting with fixed point format Andy Walker <anw@cuboid.co.uk> - 2025-08-27 00:58 +0100
            Re: Algol 68 - formatting with fixed point format Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-08-27 08:23 +0200
              Re: Algol 68 - formatting with fixed point format Andy Walker <anw@cuboid.co.uk> - 2025-08-27 23:23 +0100
                Re: Algol 68 - formatting with fixed point format Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-08-28 07:35 +0200
                Re: Algol 68 - formatting with fixed point format Andy Walker <anw@cuboid.co.uk> - 2025-08-29 00:43 +0100
                Re: Algol 68 - formatting with fixed point format Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-08-30 05:40 +0200
                Re: Algol 68 - formatting with fixed point format Andy Walker <anw@cuboid.co.uk> - 2025-08-30 20:38 +0100
                Re: Algol 68 - formatting with fixed point format Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-08-31 10:10 +0200
                Re: Algol 68 - formatting with fixed point format Andy Walker <anw@cuboid.co.uk> - 2025-09-01 17:20 +0100
                Algol 68 / Genie - new release (was Re: Algol 68 - formatting with fixed point format) Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-09-02 00:56 +0200
                Re: Algol 68 / Genie - new release Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-09-02 01:15 +0200
                Re: Algol 68 / Genie - new release (was Re: Algol 68 - formatting with fixed point format) Andy Walker <anw@cuboid.co.uk> - 2025-09-02 17:02 +0100
                Re: Algol 68 / Genie - new release (was Re: Algol 68 - formatting with fixed point format) Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-09-02 22:17 +0200
                Re: Algol 68 / Genie - new release (was Re: Algol 68 - formatting with fixed point format) Andy Walker <anw@cuboid.co.uk> - 2025-09-04 17:01 +0100
                Re: Algol 68 / Genie - new release (was Re: Algol 68 - formatting with fixed point format) Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-09-05 04:32 +0200
                Re: Algol 68 / Genie - new release (was Re: Algol 68 - formatting with fixed point format) Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-09-02 23:04 +0000
                Re: Algol 68 / Genie - new release (was Re: Algol 68 - formatting with fixed point format) Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-09-03 01:46 +0200
                Re: Algol 68 / Genie - new release (was Re: Algol 68 - formatting with fixed point format) Andy Walker <anw@cuboid.co.uk> - 2025-09-04 00:30 +0100
                Re: Algol 68 / Genie - new release Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-09-10 17:15 +0200
                Re: Algol 68 / Genie - new release Andy Walker <anw@cuboid.co.uk> - 2025-09-10 23:57 +0100
                Re: Algol 68 / Genie - new release Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-09-11 07:27 +0200
                Re: Algol 68 / Genie - new release Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-09-11 09:42 +0200
                Re: Algol 68 / Genie - new release Andy Walker <anw@cuboid.co.uk> - 2025-09-11 17:16 +0100
                Re: Algol 68 / Genie - new release bart <bc@freeuk.com> - 2025-09-27 00:41 +0100
                Re: Algol 68 / Genie - new release Andy Walker <anw@cuboid.co.uk> - 2025-09-27 14:38 +0100
                Re: Algol 68 / Genie - new release bart <bc@freeuk.com> - 2025-09-29 01:15 +0100
                Re: Algol 68 / Genie - new release Andy Walker <anw@cuboid.co.uk> - 2025-09-29 16:05 +0100
                Re: Algol 68 / Genie - new release Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-09-29 18:57 +0200
                Re: Algol 68 / Genie - new release Andy Walker <anw@cuboid.co.uk> - 2025-09-30 15:58 +0100
                Re: Algol 68 / Genie - new release Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-09-30 17:48 +0200
                Re: Algol 68 / Genie - new release bart <bc@freeuk.com> - 2025-09-29 19:08 +0100
                Re: Algol 68 / Genie - new release Andy Walker <anw@cuboid.co.uk> - 2025-09-30 23:23 +0100
                Re: Algol 68 / Genie - new release bart <bc@freeuk.com> - 2025-10-01 23:00 +0100
                Re: Algol 68 / Genie - new release Andy Walker <anw@cuboid.co.uk> - 2025-10-02 16:55 +0100
                Re: Algol 68 / Genie - new release Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-10-02 21:51 +0000
                Re: Algol 68 / Genie - new release bart <bc@freeuk.com> - 2025-10-04 12:38 +0100
                Re: Algol 68 / Genie - new release Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-10-04 14:04 +0200
                Re: Algol 68 / Genie - new release Andy Walker <anw@cuboid.co.uk> - 2025-10-04 13:47 +0100
                Re: Algol 68 / Genie - new release Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-10-04 15:03 +0200
                Re: Algol 68 / Genie - new release bart <bc@freeuk.com> - 2025-10-04 15:07 +0100
                Re: Algol 68 / Genie - new release Andy Walker <anw@cuboid.co.uk> - 2025-10-04 18:40 +0100
                Re: Algol 68 / Genie - new release bart <bc@freeuk.com> - 2025-10-04 19:46 +0100
                Re: Algol 68 / Genie - new release Andy Walker <anw@cuboid.co.uk> - 2025-10-07 16:37 +0100
                Re: Algol 68 / Genie - new release bart <bc@freeuk.com> - 2025-10-07 17:16 +0100
                Re: Algol 68 / Genie - new release Andy Walker <anw@cuboid.co.uk> - 2025-10-07 23:58 +0100
                Re: Algol 68 / Genie - new release Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-10-08 01:20 +0200
                Re: Algol 68 / Genie - new release Andy Walker <anw@cuboid.co.uk> - 2025-10-08 16:10 +0100
                Re: Algol 68 / Genie - new release bart <bc@freeuk.com> - 2025-10-08 17:41 +0100
                Re: Algol 68 / Genie - new release Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-10-09 00:53 +0200
                Re: Algol 68 / Genie - new release bart <bc@freeuk.com> - 2025-10-09 01:02 +0100
                Re: Algol 68 / Genie - new release Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-10-08 01:09 +0200
                Re: Algol 68 / Genie - new release bart <bc@freeuk.com> - 2025-10-07 22:27 +0100
                Re: Algol 68 / Genie - new release richard@cogsci.ed.ac.uk (Richard Tobin) - 2025-10-08 00:20 +0000
                Re: Algol 68 / Genie - new release Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-10-04 22:00 +0000
                Re: Algol 68 / Genie - new release Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-10-05 00:31 +0200
                Re: Algol 68 / Genie - new release bart <bc@freeuk.com> - 2025-10-05 01:52 +0100
                Re: Algol 68 / Genie - new release Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-10-05 03:15 +0000
                Re: Algol 68 / Genie - new release bart <bc@freeuk.com> - 2025-10-05 11:05 +0100
                Re: Algol 68 / Genie - new release Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-10-05 20:20 +0000
                Re: Algol 68 / Genie - new release David Brown <david.brown@hesbynett.no> - 2025-10-06 09:44 +0200
                Higher order functions (was Re: Algol 68 / Genie - new release) Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-10-06 10:01 +0200
                Re: Higher order functions (was Re: Algol 68 / Genie - new release) David Brown <david.brown@hesbynett.no> - 2025-10-06 10:56 +0200
                Re: Algol 68 / Genie - new release bart <bc@freeuk.com> - 2025-10-06 11:03 +0100
                Re: Algol 68 / Genie - new release Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-10-06 22:01 +0000
                Re: Algol 68 / Genie - new release bart <bc@freeuk.com> - 2025-10-06 23:46 +0100
                Re: Algol 68 / Genie - new release Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-10-06 23:05 +0000
                Re: Algol 68 / Genie - new release bart <bc@freeuk.com> - 2025-10-07 10:32 +0100
                Re: Algol 68 / Genie - new release Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-10-08 04:57 +0000
                Re: Algol 68 / Genie - new release David Brown <david.brown@hesbynett.no> - 2025-10-05 13:24 +0200
                Re: Algol 68 / Genie - new release antispam@fricas.org (Waldek Hebisch) - 2025-10-08 20:21 +0000
                Re: Algol 68 / Genie - new release Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-10-08 21:30 +0000
                Re: Algol 68 / Genie - new release bart <bc@freeuk.com> - 2025-10-08 22:40 +0100
                Re: Algol 68 / Genie - new release antispam@fricas.org (Waldek Hebisch) - 2025-10-10 04:18 +0000
                Re: Algol 68 / Genie - new release bart <bc@freeuk.com> - 2025-10-10 16:21 +0100
                Re: Algol 68 / Genie - new release antispam@fricas.org (Waldek Hebisch) - 2025-10-11 00:05 +0000
                Re: Algol 68 / Genie - new release bart <bc@freeuk.com> - 2025-10-11 11:25 +0100
                Re: Algol 68 / Genie - new release Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-10-11 13:08 +0200
                Re: Algol 68 / Genie - new release bart <bc@freeuk.com> - 2025-10-11 15:25 +0100
                Re: Algol 68 / Genie - new release antispam@fricas.org (Waldek Hebisch) - 2025-10-11 12:39 +0000
                Re: Algol 68 / Genie - new release Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-10-09 00:34 +0200
                Re: Algol 68 / Genie - new release antispam@fricas.org (Waldek Hebisch) - 2025-10-09 03:15 +0000
                Re: Algol 68 / Genie - new release ram@zedat.fu-berlin.de (Stefan Ram) - 2025-10-09 08:59 +0000
                Re: Algol 68 / Genie - new release antispam@fricas.org (Waldek Hebisch) - 2025-10-09 14:31 +0000
                Re: Algol 68 / Genie - new release ram@zedat.fu-berlin.de (Stefan Ram) - 2025-10-09 14:53 +0000
                Re: Algol 68 / Genie - new release ram@zedat.fu-berlin.de (Stefan Ram) - 2025-10-09 10:35 +0000
                Re: Algol 68 / Genie - new release Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-10-09 21:37 +0000
                Re: Algol 68 / Genie - new release David Brown <david.brown@hesbynett.no> - 2025-10-10 17:40 +0200
                Re: Algol 68 / Genie - new release bart <bc@freeuk.com> - 2025-10-10 20:04 +0100
                Re: Algol 68 / Genie - new release Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-10-10 21:45 +0000
                Re: Algol 68 / Genie - new release bart <bc@freeuk.com> - 2025-10-11 00:29 +0100
                Re: Algol 68 / Genie - new release Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-10-11 00:16 +0000
                Re: Algol 68 / Genie - new release bart <bc@freeuk.com> - 2025-10-11 01:59 +0100
                Re: Algol 68 / Genie - new release Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-10-11 01:42 +0000
                Re: Algol 68 / Genie - new release bart <bc@freeuk.com> - 2025-10-11 10:42 +0100
                Re: Algol 68 / Genie - new release Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-10-31 06:51 +0000
                Re: Algol 68 / Genie - new release David Brown <david.brown@hesbynett.no> - 2025-10-13 20:58 +0200
                Re: Algol 68 / Genie - new release bart <bc@freeuk.com> - 2025-10-13 23:13 +0100
                Re: Algol 68 / Genie - new release David Brown <david.brown@hesbynett.no> - 2025-10-14 00:39 +0200
                Re: Algol 68 / Genie - new release antispam@fricas.org (Waldek Hebisch) - 2025-10-12 03:56 +0000
                Re: Algol 68 / Genie - new release David Brown <david.brown@hesbynett.no> - 2025-10-13 22:38 +0200
                Re: Algol 68 / Genie - new release antispam@fricas.org (Waldek Hebisch) - 2025-10-24 04:33 +0000
                Re: Algol 68 / Genie - new release antispam@fricas.org (Waldek Hebisch) - 2025-10-03 22:24 +0000
                Re: Algol 68 / Genie - new release Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-10-04 03:39 +0000
                Re: Algol 68 / Genie - new release bart <bc@freeuk.com> - 2025-10-04 12:19 +0100
                Re: Algol 68 / Genie - new release Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-10-04 14:16 +0200
                Re: Algol 68 / Genie - new release Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-10-04 21:05 +0000
                Re: Algol 68 / Genie - new release bart <bc@freeuk.com> - 2025-10-05 01:40 +0100
                Re: Algol 68 / Genie - new release Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-10-05 03:13 +0000
                Re: Algol 68 / Genie - new release antispam@fricas.org (Waldek Hebisch) - 2025-10-05 01:29 +0000
                Re: Algol 68 / Genie - new release Andy Walker <anw@cuboid.co.uk> - 2025-10-07 15:25 +0100
                Re: Algol 68 / Genie - new release bart <bc@freeuk.com> - 2025-10-07 17:03 +0100
                Re: Algol 68 / Genie - new release Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-10-07 22:09 +0000
                Re: Algol 68 / Genie - new release Adam Sampson <ats@offog.org> - 2025-10-08 18:22 +0100
                Re: Algol 68 / Genie - new release Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-10-08 21:48 +0000
                Re: Algol 68 / Genie - new release antispam@fricas.org (Waldek Hebisch) - 2025-10-08 23:45 +0000
            Re: Algol 68 - formatting with fixed point format Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-08-30 06:54 +0200
              Re: Algol 68 - formatting with fixed point format Andy Walker <anw@cuboid.co.uk> - 2025-08-31 00:44 +0100
                Re: Algol 68 - formatting with fixed point format Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-08-31 08:12 +0000
                Re: Algol 68 - formatting with fixed point format Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-08-31 10:42 +0200
                Re: Algol 68 - formatting with fixed point format Andy Walker <anw@cuboid.co.uk> - 2025-09-01 00:10 +0100
                Re: Algol 68 - formatting with fixed point format Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-09-01 07:30 +0000
                Re: Algol 68 - formatting with fixed point format Andy Walker <anw@cuboid.co.uk> - 2025-09-01 16:13 +0100
                Re: Algol 68 - formatting with fixed point format Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-09-01 22:41 +0000
                Re: Algol 68 - formatting with fixed point format Andy Walker <anw@cuboid.co.uk> - 2025-09-02 14:23 +0100
                Re: Algol 68 - formatting with fixed point format Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-09-02 23:08 +0000
                Re: Algol 68 - formatting with fixed point format Andy Walker <anw@cuboid.co.uk> - 2025-09-04 00:54 +0100
                Re: Algol 68 - formatting with fixed point format Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-08-31 10:29 +0200
    Re: Algol 68 - formatting with fixed point format Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-08-24 02:47 +0000

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