Re: [PC] Simple AST

From	Tim Rentsch <tr.17687@z991.linuxsc.com>
Newsgroups	comp.lang.c
Subject	Re: [PC] Simple AST
Date	2019-03-06 08:34 -0800
Organization	A noiseless patient Spider
Message-ID	<86ef7kufly.fsf@mailhub.linuxsc.com> (permalink)
References	<28f4e80d-4ff5-44d3-bdec-eb593f551575@googlegroups.com> <q4hrja$iv0$1@news.albasani.net> <e94db73c-151b-472f-83dc-2f6f4b96dfa6@googlegroups.com> <ui3q6e95k7lls5428eum681c7jd3f517mi@4ax.com> <m2pnrm97mc.fsf@despina.home>

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"Pascal J. Bourguignon" <pjb@informatimago.com> writes:

> Rosario19 <Ros@invalid.invalid> writes:
>
>> [..concerning whitespace in program source..]
>>
>> one program language without white spaces has readability == 0
>
> Not really.  If you can still use tab for indents, you're ok.
>
> int main(){
>    int a=42;
>    int b=33;
>    if((a<b)||(33==b)){
>       printf("less\n");}
>    else{
>       printf("more\n");}
>    return(0);}
>
>> the true because program now are more readable it is not because
>> they invent loop instructions (for break ecc) and structural
>> instructions but main, because **indentation** and visual
>> rememeber of loop and using indentation and spaces for show
>> rendundance in the code...
>
> Don't use spaces other than where required to separate tokens, and
> for indentation (spaces pay more than tabs).  But don't use them
> in expression:  they're misleading!
>
>     a = b+c * d; // spaces fail all the time.
>
> Instead, use parentheses:
>
>     a=(b+(c*d));

This advice has it exactly backwards.  For visual separation,
spaces are better than parentheses because they are a better
match to human perceptual hardware.  For semantic grouping,
variable spacing is better than parentheses, both because it is
more readily perceived, and because it offers a redundancy that
can be used as a check on what the author intended.  The
"misleadingness" in the example (and other similar examples) can
be programmatically detected, and provides a tipoff that there is
something wrong - either a misunderstanding on the part of the
author, or a mistake in the algorithm, or perhaps both.  Using
spacing to (redundantly) show grouping adds useful information.
Taking out all spaces and putting in redundant parentheses takes
away information that is often useful - a losing proposition all
the way around.

Thread

[PC] Simple AST luser droog <luser.droog@gmail.com> - 2019-02-16 14:23 -0800
  Re: [PC] Simple AST BGB <cr88192@hotmail.com> - 2019-02-19 15:14 -0600
    Re: [PC] Simple AST luser droog <luser.droog@gmail.com> - 2019-02-19 19:51 -0800
      Re: [PC] Simple AST Rosario19 <Ros@invalid.invalid> - 2019-02-20 09:28 +0100
        Re: [PC] Simple AST "Pascal J. Bourguignon" <pjb@informatimago.com> - 2019-02-20 09:39 +0100
          Re: [PC] Simple AST Tim Rentsch <tr.17687@z991.linuxsc.com> - 2019-03-06 08:34 -0800
            Re: [PC] Simple AST "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2019-03-06 09:02 -0800
              Re: [PC] Simple AST "I Set My Girlfriend's Pantyhose on Fire" <cdalten@gmail.com> - 2019-03-06 11:14 -0800
              Re: [PC] Simple AST Ian Collins <ian-news@hotmail.com> - 2019-03-07 14:11 +1300
                Re: [PC] Simple AST "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2019-03-06 17:48 -0800
                Re: [PC] Simple AST Ian Collins <ian-news@hotmail.com> - 2019-03-07 15:21 +1300
                Re: [PC] Simple AST luser droog <luser.droog@gmail.com> - 2019-03-06 18:28 -0800
                Re: [PC] Simple AST luser droog <luser.droog@gmail.com> - 2019-03-06 18:37 -0800
                Re: [PC] Simple AST "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2019-03-06 18:47 -0800
                Re: [PC] Simple AST luser droog <luser.droog@gmail.com> - 2019-03-06 18:53 -0800
            Re: [PC] Simple AST "Pascal J. Bourguignon" <pjb@informatimago.com> - 2019-03-06 18:38 +0100
              Re: [PC] Simple AST Keith Thompson <kst-u@mib.org> - 2019-03-06 09:53 -0800
                Re: [PC] Simple AST "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2019-03-06 09:59 -0800
                Re: [PC] Simple AST "Pascal J. Bourguignon" <pjb@informatimago.com> - 2019-03-06 19:49 +0100
                Re: [PC] Simple AST Bart <bc@freeuk.com> - 2019-03-06 19:23 +0000
                Re: [PC] Simple AST David Brown <david.brown@hesbynett.no> - 2019-03-06 23:29 +0100
                Re: [PC] Simple AST BGB <cr88192@hotmail.com> - 2019-03-06 21:54 -0600
                Re: [PC] Simple AST James Kuyper <jameskuyper@alumni.caltech.edu> - 2019-03-08 18:52 -0500
                Re: [PC] Simple AST "Pascal J. Bourguignon" <pjb@informatimago.com> - 2019-03-09 01:56 +0100
                Re: [PC] Simple AST Keith Thompson <kst-u@mib.org> - 2019-03-08 18:22 -0800
                Re: [PC] Simple AST David Brown <david.brown@hesbynett.no> - 2019-03-09 14:02 +0100
                Re: [PC] Simple AST Keith Thompson <kst-u@mib.org> - 2019-03-09 12:20 -0800
                Re: [PC] Simple AST David Brown <david.brown@hesbynett.no> - 2019-03-10 00:04 +0100
                Re: [PC] Simple AST Ben Bacarisse <ben.usenet@bsb.me.uk> - 2019-03-09 02:28 +0000
                Re: [PC] Simple AST BGB <cr88192@gmail.com> - 2019-03-08 23:06 -0600
                Re: [PC] Simple AST Tim Rentsch <tr.17687@z991.linuxsc.com> - 2019-03-12 23:06 -0700
                Re: [PC] Simple AST Jorgen Grahn <grahn+nntp@snipabacken.se> - 2019-03-14 06:48 +0000
                Re: [PC] Simple AST James Kuyper <jameskuyper@alumni.caltech.edu> - 2019-03-14 07:14 -0400
                Re: [PC] Simple AST Jorgen Grahn <grahn+nntp@snipabacken.se> - 2019-03-14 14:58 +0000
                Re: [PC] Simple AST James Kuyper <jameskuyper@alumni.caltech.edu> - 2019-03-14 10:13 -0700
                Re: [PC] Simple AST Tim Rentsch <tr.17687@z991.linuxsc.com> - 2019-03-18 08:34 -0700
                Re: [PC] Simple AST Tim Rentsch <tr.17687@z991.linuxsc.com> - 2019-03-23 10:57 -0700
                Re: [PC] Simple AST James Kuyper <jameskuyper@alumni.caltech.edu> - 2019-03-25 11:42 -0700
                Re: [PC] Simple AST Tim Rentsch <tr.17687@z991.linuxsc.com> - 2019-03-18 07:18 -0700
                Re: [PC] Simple AST Bart <bc@freeuk.com> - 2019-03-14 15:34 +0000
                Divorcing rabbits with Tim R (Was: [PC] Simple AST) gazelle@shell.xmission.com (Kenny McCormack) - 2019-03-14 16:52 +0000
                Re: [PC] Simple AST Keith Thompson <kst-u@mib.org> - 2019-03-06 22:12 -0800
                Re: [PC] Simple AST David Brown <david.brown@hesbynett.no> - 2019-03-07 08:54 +0100
                Re: [PC] Simple AST "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2019-03-07 03:20 -0800
                Re: [PC] Simple AST Tim Rentsch <tr.17687@z991.linuxsc.com> - 2019-03-12 23:08 -0700
                Re: [PC] Simple AST luser droog <luser.droog@gmail.com> - 2019-03-06 14:08 -0800
                Re: [PC] Simple AST Keith Thompson <kst-u@mib.org> - 2019-03-06 22:13 -0800
              Re: [PC] Simple AST Ben Bacarisse <ben.usenet@bsb.me.uk> - 2019-03-06 19:38 +0000
                Re: [PC] Simple AST "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2019-03-06 11:54 -0800
                Re: [PC] Simple AST Anton Shepelev <anton.txt@g{oogle}mail.com> - 2019-03-07 14:43 +0300
                Re: [PC] Simple AST "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2019-03-07 03:58 -0800
                Re: [PC] Simple AST David Brown <david.brown@hesbynett.no> - 2019-03-07 13:07 +0100
        Re: [PC] Simple AST Rosario19 <Ros@invalid.invalid> - 2019-02-20 10:35 +0100
    Re: [PC] Simple AST Bart <bc@freeuk.com> - 2019-02-20 14:26 +0000
      Re: [PC] Simple AST BGB <cr88192@hotmail.com> - 2019-02-20 14:32 -0600
        Re: [PC] Simple AST "I Set My Girlfriend's Pantyhose on Fire" <cdalten@gmail.com> - 2019-02-21 13:38 -0800
        Re: [PC] Simple AST Thiago Adams <thiago.adams@gmail.com> - 2019-02-22 04:03 -0800

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