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From: Tim Rentsch <tr.17687@z991.linuxsc.com>
Newsgroups: comp.lang.c
Subject: Re: Programming exercise/challenge
Date: Thu, 10 Dec 2020 20:32:58 -0800
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Anton Shepelev <anton.txt@gmail.com> writes:

> Tim Rentsch:
>
>> If I work up a list of "interesting inputs" would you like
>> to see those?  I'm considering doing that but haven't
>> absolutely decided yet.
>
> Yes.  It would be a good supplement to the collectioon of
> solutions.

Some cases follow.  At the start of each example line is a marker
(==) to indicate it is an example (and which go on for one or
more lines after the ==).  End of file is indicated by <EOF>.  A
line marked with ==x is an error example.  A line marked as ==~
shows an example that might be accepted as good but doesn't have
to be.  None of the example lines have trailing spaces.

Disclaimer:  I have tried to be accurate.  Forgive me if there are
any mistakes in the labelling.  I haven't been as thorough as I
would have liked, but for better or worse here are some cases.


 ==   ''

 ==   'z'

 ==x   '

 ==x   '<EOF>

 ==    '\a'

 ==    '\
'

 ==    '\
z'

 ==x   '\<EOF>

 ==    '\\
a'

 ==x   '\\<EOF>

 ==    '\\'

 ==    '\\z'

 ==    '\\\a'

 ==x    '\\

        yyy'

 ==     '\\
\'



 ==   ""

 ==   "z"

 ==x   "

 ==x   "<EOF>

 ==    "\a"

 ==    "\
"

 ==    "\
z"

 ==x   "\<EOF>

 ==    "\\
a"

 ==x   "\\<EOF>

 ==    "\\"

 ==    "\\z"

 ==    "\\\a"

 ==x    "\\

        yyy"

 ==     "\\
\"



 ==~    /<EOF>

 ==~    /\<EOF>

 ==~    //<EOF>

 ==~    //\<EOF>

 ==~    //\
<EOF>

 ==     /z

 ==     /\
z

 ==     /\
\
z

 ==     //z

 ==     /\
/z

 ==     /\
/\
z

 ==     //\\
z

 ==     //\\z


 

 ==x    /*<EOF>

 ==x    /*\<EOF>

 ==x    /*\
<EOF>

 ==x    /**<EOF>

 ==x    /**\<EOF>

 ==x    /**\
<EOF>

 ==     /\
*z*/

 ==     /\
***/

 ==     /\
*\\
*/

 ==     /*z*/

 ==     /***\
/

 ==     /***\*\
/