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Re: An enhancement

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From Spiros Bousbouras <spibou@gmail.com>
Newsgroups comp.lang.c
Subject Re: An enhancement
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Xref csiph.com comp.lang.c:136449

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On Mon, 8 Oct 2018 15:44:14 -0700 (PDT)
David Kleinecke <dkleinecke@gmail.com> wrote:
> I want to propose an enhancement:
> 
> Add to C the statement type
>     DO identifier SEMICOLON
> where the identifier is a label. The meaning is that
> the statement just identified is replaced by the
> statement following the label.

[...]

> The purpose of this enhancement is to enable
> top-down coding in the sense Knuth wanted with
> his literate programming. You can write code
> like:
>     int foo (int x) {
>         if (x < 0) do trivial_case;
>         else if (x == 0) do easy_case;
>         else do usual_case;
>         return;
>      trivial_case: { 
>         .... }
>      easy_case: { 
>         .... }
>      usual_case: { 
>         .... }}
> which is generally easier to understand if you have
> given as labels good descriptive phrases.

You could achieve the same with macros :

int foo (int x) {
#define  trivial_case {  \
    ....                 \
}
#define  easy_case {     \
    ....                 \
}
#define  usual_case {    \
    ....                 \
}
    if (x < 0) trivial_case
    else if (x == 0) easy_case
    else usual_case
    return 13 ;
}

Your code looks cleaner but I'm not sure the difference is worth adding
the new syntax.

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An enhancement David Kleinecke <dkleinecke@gmail.com> - 2018-10-08 15:44 -0700
  Re: An enhancement Ian Collins <ian-news@hotmail.com> - 2018-10-09 11:48 +1300
    Re: An enhancement Spiros Bousbouras <spibou@gmail.com> - 2018-10-08 23:16 +0000
  Re: An enhancement Ben Bacarisse <ben.usenet@bsb.me.uk> - 2018-10-09 00:30 +0100
    Re: An enhancement David Kleinecke <dkleinecke@gmail.com> - 2018-10-08 17:24 -0700
      Re: An enhancement Ben Bacarisse <ben.usenet@bsb.me.uk> - 2018-10-09 02:12 +0100
        Re: An enhancement David Kleinecke <dkleinecke@gmail.com> - 2018-10-08 22:42 -0700
          Re: An enhancement Ben Bacarisse <ben.usenet@bsb.me.uk> - 2018-10-09 14:41 +0100
        Re: An enhancement David Brown <david.brown@hesbynett.no> - 2018-10-09 11:15 +0200
          Re: An enhancement Ben Bacarisse <ben.usenet@bsb.me.uk> - 2018-10-09 16:09 +0100
            GCC nested functions: deprecated? (Was: An enhancement) gazelle@shell.xmission.com (Kenny McCormack) - 2018-10-09 15:36 +0000
            Re: An enhancement David Brown <david.brown@hesbynett.no> - 2018-10-09 21:01 +0200
        Re: An enhancement Bart <bc@freeuk.com> - 2018-10-09 11:43 +0100
          Re: An enhancement already5chosen@yahoo.com - 2018-10-09 04:08 -0700
            Re: An enhancement Bart <bc@freeuk.com> - 2018-10-09 12:29 +0100
  Re: An enhancement Spiros Bousbouras <spibou@gmail.com> - 2018-10-08 23:37 +0000
    Re: An enhancement David Kleinecke <dkleinecke@gmail.com> - 2018-10-08 17:22 -0700
      Re: An enhancement Ian Collins <ian-news@hotmail.com> - 2018-10-09 13:30 +1300
      Re: An enhancement Spiros Bousbouras <spibou@gmail.com> - 2018-10-09 05:23 +0000
        Re: An enhancement David Kleinecke <dkleinecke@gmail.com> - 2018-10-08 22:50 -0700
        Re: An enhancement Richard Damon <Richard@Damon-Family.org> - 2018-10-09 08:28 -0400
      Re: An enhancement Wouter Verhelst <w@uter.be> - 2018-10-09 14:05 +0200
        C is often used as an "implementation language" for other languages.  (Was: An enhancement) gazelle@shell.xmission.com (Kenny McCormack) - 2018-10-09 13:13 +0000
          Re: C is often used as an "implementation language" for other languages.  (Was: An enhancement) David Brown <david.brown@hesbynett.no> - 2018-10-09 16:51 +0200
        Re: An enhancement Bart <bc@freeuk.com> - 2018-10-09 14:17 +0100
      Re: An enhancement Thiago Adams <thiago.adams@gmail.com> - 2018-10-09 05:20 -0700
        Re: An enhancement David Kleinecke <dkleinecke@gmail.com> - 2018-10-09 11:33 -0700
          Re: An enhancement Thiago Adams <thiago.adams@gmail.com> - 2018-10-09 13:41 -0700
    Re: An enhancement Bart <bc@freeuk.com> - 2018-10-09 12:35 +0100
  Re: An enhancement Wouter Verhelst <w@uter.be> - 2018-10-09 14:04 +0200
    Re: An enhancement Spiros Bousbouras <spibou@gmail.com> - 2018-10-09 12:29 +0000
      Re: An enhancement Wouter Verhelst <w@uter.be> - 2018-10-09 19:50 +0200
      Re: An enhancement queequeg@trust.no1 (Queequeg) - 2018-10-15 09:19 +0000
        Re: An enhancement already5chosen@yahoo.com - 2018-10-15 03:07 -0700
          Re: An enhancement Ian Collins <ian-news@hotmail.com> - 2018-10-15 23:18 +1300
            Re: An enhancement already5chosen@yahoo.com - 2018-10-15 03:39 -0700
              Re: An enhancement David Brown <david.brown@hesbynett.no> - 2018-10-15 13:03 +0200
                Re: An enhancement Bart <bc@freeuk.com> - 2018-10-15 12:15 +0100
                Re: An enhancement Thiago Adams <thiago.adams@gmail.com> - 2018-10-15 05:20 -0700
                Re: An enhancement Ben Bacarisse <ben.usenet@bsb.me.uk> - 2018-10-15 15:39 +0100
                Re: An enhancement David Brown <david.brown@hesbynett.no> - 2018-10-15 14:36 +0200
                Re: An enhancement Thiago Adams <thiago.adams@gmail.com> - 2018-10-15 05:59 -0700
                Re: An enhancement David Brown <david.brown@hesbynett.no> - 2018-10-15 15:08 +0200
                Re: An enhancement Thiago Adams <thiago.adams@gmail.com> - 2018-10-15 07:25 -0700
                Re: An enhancement Ben Bacarisse <ben.usenet@bsb.me.uk> - 2018-10-15 15:44 +0100
                Re: An enhancement David Kleinecke <dkleinecke@gmail.com> - 2018-10-15 19:02 -0700
                Re: An enhancement Jorgen Grahn <grahn+nntp@snipabacken.se> - 2018-10-16 05:55 +0000
                Re: An enhancement jameskuyper@alumni.caltech.edu - 2018-10-16 05:37 -0700
                Re: An enhancement Ben Bacarisse <ben.usenet@bsb.me.uk> - 2018-10-16 15:11 +0100
                Re: An enhancement David Kleinecke <dkleinecke@gmail.com> - 2018-10-16 13:33 -0700
                Re: An enhancement David Kleinecke <dkleinecke@gmail.com> - 2018-10-16 21:27 -0700
                Re: An enhancement Ben Bacarisse <ben.usenet@bsb.me.uk> - 2018-10-16 14:57 +0100
                Re: An enhancement scott@slp53.sl.home (Scott Lurndal) - 2018-10-16 14:24 +0000
                Re: An enhancement mark.bluemel@gmail.com - 2018-10-16 07:28 -0700
                Re: An enhancement Bart <bc@freeuk.com> - 2018-10-16 15:25 +0100
            Re: An enhancement Bart <bc@freeuk.com> - 2018-10-15 11:44 +0100
              Re: An enhancement David Brown <david.brown@hesbynett.no> - 2018-10-15 13:08 +0200
          Re: An enhancement Bart <bc@freeuk.com> - 2018-10-15 11:22 +0100
            Re: An enhancement David Brown <david.brown@hesbynett.no> - 2018-10-15 13:01 +0200
              Re: An enhancement Nick Bowler <nbowler@draconx.ca> - 2018-10-15 14:43 +0000

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