Re: Some ideas about c?

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From	Keith Thompson <kst-u@mib.org>
Newsgroups	comp.lang.c
Subject	Re: Some ideas about c?
Date	Fri, 19 May 2017 12:01:28 -0700
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Gareth Owen <gwowen@gmail.com> writes:
> scott@slp53.sl.home (Scott Lurndal) writes:
>> Gareth Owen <gwowen@gmail.com> writes:
>>>scott@slp53.sl.home (Scott Lurndal) writes:
>>>> int main() { char buffer[512]; fputs(fgets(buffer, sizeof(buffer),
>>>> stdin), stdout); }
>>>
>>>Great.  Except it doesn't work if the input line is too big.
>>
>> Sure it does.  It just truncates it.  And the programmer is, of
>> course, aware of that.
>
> If I want a program to duplicate the line, and sometimes it truncates it
> then that program does not work correctly.  For every programming
> problem there is a solution that is short, elegant and wrong.
>
>>>
>>>> For that matter, this code also compiles just fine as C++ code.
>>>
>>>But doesn't run fine as either.  I assume, you knew that.
>>
>> Actually, it does compile and run using the C++ compiler.
>
> Except that sometimes it does not duplicate the output correctly.
>
> The program has a bug in it - to whit whenever an input line is longer
> than 512 bytes, the output is incorrect.

One way to address that issue would be to modify the problem statement
so that the program's behavior is undefined if the input line (including
the trailing newline) is longer than 512 characters.

That might seem silly but there are times when it's not unreasonable to
document that a program is intended to work only with some restricted
input.

-- 
Keith Thompson (The_Other_Keith) kst-u@mib.org  <http://www.ghoti.net/~kst>
Working, but not speaking, for JetHead Development, Inc.
"We must do something.  This is something.  Therefore, we must do this."
    -- Antony Jay and Jonathan Lynn, "Yes Minister"

Thread

Some ideas about c? Vassilis Spiliopoulos <vassilis@vask1lux.de> - 2017-05-17 23:23 +0300
  Re: Some ideas about c? Ian Collins <ian-news@hotmail.com> - 2017-05-18 08:40 +1200
  Re: Some ideas about c? GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-05-17 23:00 +0200
    Re: Some ideas about c? supercat@casperkitty.com - 2017-05-17 14:59 -0700
      Re: Some ideas about c? GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-05-18 00:08 +0200
        Re: Some ideas about c? supercat@casperkitty.com - 2017-05-17 22:09 -0700
          Re: Some ideas about c? Ian Collins <ian-news@hotmail.com> - 2017-05-18 18:22 +1200
          Re: Some ideas about c? GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-05-18 12:36 +0200
            Re: Some ideas about c? Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2017-05-18 03:53 -0700
              Re: Some ideas about c? GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-05-18 14:24 +0200
                Re: Some ideas about c? Jerry Stuckle <jstucklex@attglobal.net> - 2017-05-18 08:37 -0400
                Re: Some ideas about c? Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2017-05-18 05:47 -0700
                Re: Some ideas about c? GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-05-18 15:20 +0200
                Re: Some ideas about c? Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2017-05-18 06:28 -0700
                Re: Some ideas about c? scott@slp53.sl.home (Scott Lurndal) - 2017-05-18 13:56 +0000
                Re: Some ideas about c? GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-05-18 16:30 +0200
                Re: Some ideas about c? Thiago Adams <thiago.adams@gmail.com> - 2017-05-18 07:45 -0700
                Re: Some ideas about c? Richard Heathfield <rjh@cpax.org.uk> - 2017-05-18 16:08 +0100
                Re: Some ideas about c? Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2017-05-18 08:15 -0700
                Re: Some ideas about c? Jerry Stuckle <jstucklex@attglobal.net> - 2017-05-18 11:46 -0400
                Re: Some ideas about c? Vassilis Spiliopoulos <vassilis@vask1lux.de> - 2017-05-18 21:33 +0300
                Re: Some ideas about c? Jerry Stuckle <jstucklex@attglobal.net> - 2017-05-18 15:29 -0400
                Re: Some ideas about c? GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-05-19 01:23 +0200
                Re: Some ideas about c? Thiago Adams <thiago.adams@gmail.com> - 2017-05-18 18:12 -0700
                Re: Some ideas about c? Thiago Adams <thiago.adams@gmail.com> - 2017-05-18 10:08 -0700
                Re: Some ideas about c? GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-05-19 00:39 +0200
                Re: Some ideas about c? Vassilis Spiliopoulos <vassilis@vask1lux.de> - 2017-05-19 14:27 +0300
                Re: Some ideas about c? David Brown <david.brown@hesbynett.no> - 2017-05-19 13:41 +0200
                Re: Some ideas about c? Richard Heathfield <rjh@cpax.org.uk> - 2017-05-19 13:04 +0100
                Re: Some ideas about c? Keith Thompson <kst-u@mib.org> - 2017-05-19 10:00 -0700
                Re: Some ideas about c? GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-05-19 14:14 +0200
                Re: Some ideas about c? Jerry Stuckle <jstucklex@attglobal.net> - 2017-05-18 11:33 -0400
                Re: Some ideas about c? Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2017-05-18 08:47 -0700
                Re: Some ideas about c? supercat@casperkitty.com - 2017-05-18 08:48 -0700
                Re: Some ideas about c? Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2017-05-18 09:02 -0700
                Re: Some ideas about c? supercat@casperkitty.com - 2017-05-18 10:52 -0700
                Re: Some ideas about c? Jerry Stuckle <jstucklex@attglobal.net> - 2017-05-18 15:35 -0400
                Re: Some ideas about c? supercat@casperkitty.com - 2017-05-18 14:01 -0700
                Re: Some ideas about c? Jerry Stuckle <jstucklex@attglobal.net> - 2017-05-18 17:38 -0400
                Re: Some ideas about c? supercat@casperkitty.com - 2017-05-18 15:54 -0700
                Re: Some ideas about c? Jerry Stuckle <jstucklex@attglobal.net> - 2017-05-18 22:17 -0400
                Re: Some ideas about c? John Bode <jfbode1029@gmail.com> - 2017-05-18 08:06 -0700
                Re: Some ideas about c? John Bode <jfbode1029@gmail.com> - 2017-05-18 09:17 -0700
  Re: Some ideas about c? fir <profesor.fir@gmail.com> - 2017-05-17 14:34 -0700
    Re: Some ideas about c? Vassilis Spiliopoulos <vassilis@vask1lux.de> - 2017-05-18 16:16 +0300
  Re: Some ideas about c? Cholo Lennon <chololennon@hotmail.com> - 2017-05-18 10:26 -0300
  Re: Some ideas about c? John Bode <jfbode1029@gmail.com> - 2017-05-18 07:36 -0700
    Re: Some ideas about c? scott@slp53.sl.home (Scott Lurndal) - 2017-05-18 18:23 +0000
      Re: Some ideas about c? Gareth Owen <gwowen@gmail.com> - 2017-05-18 21:51 +0100
        Re: Some ideas about c? scott@slp53.sl.home (Scott Lurndal) - 2017-05-19 12:38 +0000
          Re: Some ideas about c? supercat@casperkitty.com - 2017-05-19 07:44 -0700
            Re: Some ideas about c? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-05-19 16:45 +0100
              Re: Some ideas about c? Tim Rentsch <txr@alumni.caltech.edu> - 2017-05-19 21:59 -0700
            Re: Some ideas about c? Keith Thompson <kst-u@mib.org> - 2017-05-19 10:06 -0700
              Re: Some ideas about c? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-05-19 18:18 +0100
                Re: Some ideas about c? Keith Thompson <kst-u@mib.org> - 2017-05-19 11:59 -0700
                Re: Some ideas about c? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-05-19 21:05 +0100
          Re: Some ideas about c? "James R. Kuyper" <jameskuyper@verizon.net> - 2017-05-19 12:42 -0400
            Re: Some ideas about c? Richard Heathfield <rjh@cpax.org.uk> - 2017-05-19 17:54 +0100
            Re: Some ideas about c? Gareth Owen <gwowen@gmail.com> - 2017-05-19 18:52 +0100
          Re: Some ideas about c? Gareth Owen <gwowen@gmail.com> - 2017-05-19 18:51 +0100
            Re: Some ideas about c? scott@slp53.sl.home (Scott Lurndal) - 2017-05-19 18:55 +0000
              Re: Some ideas about c? Gareth Owen <gwowen@gmail.com> - 2017-05-19 19:58 +0100
              Re: Some ideas about c? Keith Thompson <kst-u@mib.org> - 2017-05-19 12:12 -0700
            Re: Some ideas about c? Keith Thompson <kst-u@mib.org> - 2017-05-19 12:01 -0700
    Re: Some ideas about c? Ian Collins <ian-news@hotmail.com> - 2017-05-19 08:22 +1200
      Re: Some ideas about c? Gareth Owen <gwowen@gmail.com> - 2017-05-18 21:53 +0100
      Re: Some ideas about c? scott@slp53.sl.home (Scott Lurndal) - 2017-05-19 12:36 +0000
        Re: Some ideas about c? Gareth Owen <gwowen@gmail.com> - 2017-05-19 18:54 +0100
          Re: Some ideas about c? scott@slp53.sl.home (Scott Lurndal) - 2017-05-19 18:58 +0000
            Re: Some ideas about c? Keith Thompson <kst-u@mib.org> - 2017-05-19 12:18 -0700

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