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Re: scanf used for to get a line

From Tim Rentsch <txr@alumni.caltech.edu>
Newsgroups comp.lang.c
Subject Re: scanf used for to get a line
Date 2016-11-15 10:57 -0800
Organization A noiseless patient Spider
Message-ID <kfneg2csh95.fsf@x-alumni2.alumni.caltech.edu> (permalink)
References <15ea8d6d-0173-491c-b6b5-b1c57dd61769@googlegroups.com> <236c25a6-8c18-4082-ab3a-86eb55fb2408@googlegroups.com> <nvfoa6$lsu$1@dont-email.me> <lnfun8zffj.fsf@kst-u.example.com> <5e06af91-eec8-42cd-87c4-99d2b448de84@googlegroups.com>

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supercat@casperkitty.com writes:

> On Thursday, November 3, 2016 at 11:38:40 AM UTC-5, Keith Thompson wrote:
>> But be careful.  sscanf() has undefined behavior on numeric overflow.
>
> If one wanted to write the simplest strictly-conforming program that would
> e.g. read a line of input from stdin and:
>
>   1. If the input contains two signed numbers separated by a space, both
>      within the range of "long long", and their product is also within the
>      range of that type, output their product.
>
>   2. In all other cases, output any sequence of 0 to 1,000 characters and
>      exit.
>
> How should one make that program most simply?  [...]

The problem statement is self-contradictory.  The output depends
on implementation-defined behavior, so the program cannot
possibly be strictly conforming.

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scanf used for to get a line asetofsymbols@gmail.com - 2016-11-01 01:50 -0700
  scanf used for to get a line asetofsymbols@gmail.com - 2016-11-01 01:55 -0700
  Re: scanf used for to get a line mark.bluemel@gmail.com - 2016-11-01 03:55 -0700
    Re: scanf used for to get a line "Charles Richmond" <numerist@aquaporin4.com> - 2016-11-03 11:23 -0500
      Re: scanf used for to get a line Keith Thompson <kst-u@mib.org> - 2016-11-03 09:38 -0700
        Re: scanf used for to get a line supercat@casperkitty.com - 2016-11-03 10:08 -0700
          Re: scanf used for to get a line Keith Thompson <kst-u@mib.org> - 2016-11-03 11:29 -0700
            Re: scanf used for to get a line supercat@casperkitty.com - 2016-11-03 14:37 -0700
              Re: scanf used for to get a line Keith Thompson <kst-u@mib.org> - 2016-11-03 16:34 -0700
                Re: scanf used for to get a line supercat@casperkitty.com - 2016-11-04 10:21 -0700
                Re: scanf used for to get a line Keith Thompson <kst-u@mib.org> - 2016-11-04 11:46 -0700
                Re: scanf used for to get a line supercat@casperkitty.com - 2016-11-04 15:04 -0700
                Re: scanf used for to get a line Keith Thompson <kst-u@mib.org> - 2016-11-04 16:44 -0700
                Re: scanf used for to get a line supercat@casperkitty.com - 2016-11-04 17:13 -0700
                Re: scanf used for to get a line Keith Thompson <kst-u@mib.org> - 2016-11-04 19:12 -0700
                Re: scanf used for to get a line supercat@casperkitty.com - 2016-11-05 14:10 -0700
                Re: scanf used for to get a line Keith Thompson <kst-u@mib.org> - 2016-11-05 14:22 -0700
          Re: scanf used for to get a line Tim Rentsch <txr@alumni.caltech.edu> - 2016-11-15 10:57 -0800
            Re: scanf used for to get a line supercat@casperkitty.com - 2016-11-15 12:05 -0800
              Re: scanf used for to get a line jameskuyper@verizon.net - 2016-11-15 14:01 -0800
              Re: scanf used for to get a line Tim Rentsch <txr@alumni.caltech.edu> - 2016-11-16 10:54 -0800
              Re: scanf used for to get a line Richard Damon <Richard@Damon-Family.org> - 2016-11-21 18:01 -0500
                Re: scanf used for to get a line supercat@casperkitty.com - 2016-11-21 15:44 -0800
      Re: scanf used for to get a line asetofsymbols@gmail.com - 2016-11-03 13:35 -0700
        Re: scanf used for to get a line Keith Thompson <kst-u@mib.org> - 2016-11-03 13:50 -0700
      Re: scanf used for to get a line ImperiusDamian <damianblack.wolf@gmail.com> - 2016-11-05 16:10 -0400
  Re: scanf used for to get a line Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-11-01 11:39 +0000
    Re: scanf used for to get a line asetofsymbols@gmail.com - 2016-11-01 05:47 -0700
      Re: scanf used for to get a line Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-11-01 15:05 +0000
        Re: scanf used for to get a line asetofsymbols@gmail.com - 2016-11-02 01:42 -0700

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