Re: How to use a struct with qsort()?

From	Ben Bacarisse <ben.usenet@bsb.me.uk>
Newsgroups	comp.lang.c
Subject	Re: How to use a struct with qsort()?
Date	2019-10-19 19:36 +0100
Organization	A noiseless patient Spider
Message-ID	<87v9skzio0.fsf@bsb.me.uk> (permalink)
References	<cvHqF.33195$hU2.4342@fx20.iad> <ed2d1df6-bc5f-4344-9e0a-123f61d01f6a@googlegroups.com> <aqIqF.211712$zU2.43109@fx01.iad>

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DFS <nospam@dfs.com> writes:

> On 10/19/2019 1:22 PM, Malcolm McLean wrote:
>> On Saturday, 19 October 2019 18:13:52 UTC+1, DFS  wrote:
>>> struct words {char *word; double calc;};
>>>
>>> I tried:
>>> qsort(words, wordcnt, sizeof(words), compare);
>>>
>>> The tcc compiler throws an error: 'words' undeclared
>>>
>> "struct words" is the name of the structure. You need an array of
>> those structures to sort.
>>
>> struct words wordlist[100];
>>
>> will create an array of a hundred structures. You still need to populate
>> the list with data, which you can do with the curly brackets, or in
>> a non-test program, probably by reading in the words from a file.
>
>
> I already populated the struct with words from a file, and a
> calculation to go with each word.
>
> The qsort prototype indicates an array - so there's no way to sort the
> data already in the struct using qsort()?

You want to sort the array of structs, so there is no problem -- you
have an array as required by qsort.

-- 
Ben.

Thread

How to use a struct with qsort()? DFS <nospam@dfs.com> - 2019-10-19 13:35 -0400
  Re: How to use a struct with qsort()? Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2019-10-19 10:22 -0700
    Re: How to use a struct with qsort()? DFS <nospam@dfs.com> - 2019-10-19 14:19 -0400
      Re: How to use a struct with qsort()? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2019-10-19 19:36 +0100
      Re: How to use a struct with qsort()? Melzzzzz <Melzzzzz@zzzzz.com> - 2019-10-19 18:44 +0000
  Re: How to use a struct with qsort()? Barry Schwarz <schwarzb@delq.com> - 2019-10-19 10:23 -0700
  Re: How to use a struct with qsort()? Ike Naar <ike@sdf.lonestar.org> - 2019-10-19 19:09 +0000
    Re: How to use a struct with qsort()? DFS <nospam@dfs.com> - 2019-10-19 15:51 -0400
      Re: How to use a struct with qsort()? already5chosen@yahoo.com - 2019-10-19 13:09 -0700
        Re: How to use a struct with qsort()? DFS <nospam@dfs.com> - 2019-10-19 16:26 -0400
          Re: How to use a struct with qsort()? already5chosen@yahoo.com - 2019-10-19 13:51 -0700
            Re: How to use a struct with qsort()? DFS <nospam@dfs.com> - 2019-10-19 17:24 -0400
              Re: How to use a struct with qsort()? already5chosen@yahoo.com - 2019-10-19 14:49 -0700
                Re: How to use a struct with qsort()? DFS <nospam@dfs.com> - 2019-10-19 18:26 -0400
                Re: How to use a struct with qsort()? already5chosen@yahoo.com - 2019-10-19 16:32 -0700
                Re: How to use a struct with qsort()? DFS <nospam@dfs.com> - 2019-10-20 09:22 -0400
                Re: How to use a struct with qsort()? Paul <nospam@needed.invalid> - 2019-10-26 04:15 -0400
                Re: How to use a struct with qsort()? DFS <nospam@dfs.com> - 2019-10-26 09:37 -0400
                Re: How to use a struct with qsort()? Bart <bc@freeuk.com> - 2019-10-26 15:40 +0100
                Re: How to use a struct with qsort()? DFS <nospam@dfs.com> - 2019-10-28 19:49 -0400
                Re: How to use a struct with qsort()? Paul <nospam@needed.invalid> - 2019-10-29 01:59 -0400
                Re: How to use a struct with qsort()? Paul <nospam@needed.invalid> - 2019-10-30 04:54 -0400
                Re: How to use a struct with qsort()? Bart <bc@freeuk.com> - 2019-10-30 11:54 +0000
                Re: How to use a struct with qsort()? Keith Thompson <kst-u@mib.org> - 2019-10-30 08:58 -0700
                Re: How to use a struct with qsort()? Öö Tiib <ootiib@hot.ee> - 2019-11-07 01:10 -0800
                Re: How to use a struct with qsort()? Bart <bc@freeuk.com> - 2019-11-07 10:51 +0000
                Re: How to use a struct with qsort()? Paul <nospam@needed.invalid> - 2019-10-26 15:03 -0400
                Re: How to use a struct with qsort()? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2019-10-26 21:50 +0100
                Re: How to use a struct with qsort()? Tim Rentsch <tr.17687@z991.linuxsc.com> - 2019-11-04 16:02 -0800
            Re: How to use a struct with qsort()? Jorgen Grahn <grahn+nntp@snipabacken.se> - 2019-10-21 11:58 +0000
            Re: How to use a struct with qsort()? Tim Rentsch <tr.17687@z991.linuxsc.com> - 2019-10-23 04:51 -0700
          Re: How to use a struct with qsort()? Bart <bc@freeuk.com> - 2019-10-19 23:25 +0100
            Re: How to use a struct with qsort()? Keith Thompson <kst-u@mib.org> - 2019-10-19 15:38 -0700
              Re: How to use a struct with qsort()? David Brown <david.brown@hesbynett.no> - 2019-10-20 14:44 +0200
              Re: How to use a struct with qsort()? DFS <nospam@dfs.com> - 2019-10-22 15:42 -0400
              Re: How to use a struct with qsort()? Tim Rentsch <tr.17687@z991.linuxsc.com> - 2019-10-23 05:47 -0700
                Re: How to use a struct with qsort()? Bart <bc@freeuk.com> - 2019-10-23 16:40 +0100
                Re: How to use a struct with qsort()? Keith Thompson <kst-u@mib.org> - 2019-10-23 13:51 -0700
                Re: How to use a struct with qsort()? Bart <bc@freeuk.com> - 2019-10-23 23:07 +0100
                Re: How to use a struct with qsort()? Keith Thompson <kst-u@mib.org> - 2019-10-23 15:50 -0700
                Re: How to use a struct with qsort()? Bart <bc@freeuk.com> - 2019-10-24 01:20 +0100
                Re: How to use a struct with qsort()? Keith Thompson <kst-u@mib.org> - 2019-10-23 18:20 -0700
                Re: How to use a struct with qsort()? Bart <bc@freeuk.com> - 2019-10-24 10:40 +0100
                Re: How to use a struct with qsort()? Keith Thompson <kst-u@mib.org> - 2019-10-24 11:00 -0700
          Re: How to use a struct with qsort()? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2019-10-20 00:30 +0100
            Re: How to use a struct with qsort()? Bart <bc@freeuk.com> - 2019-10-20 00:44 +0100
          Re: How to use a struct with qsort()? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2019-10-20 01:27 +0100
          Re: How to use a struct with qsort()? Manfred <noname@add.invalid> - 2019-10-25 20:30 +0200
            Re: How to use a struct with qsort()? DFS <nospam@dfs.com> - 2019-10-25 16:07 -0400
            Re: How to use a struct with qsort()? Ike Naar <ike@sdf.lonestar.org> - 2019-10-26 07:27 +0000
              Re: How to use a struct with qsort()? Keith Thompson <kst-u@mib.org> - 2019-10-26 02:11 -0700
            Re: How to use a struct with qsort()? Bart <bc@freeuk.com> - 2019-10-26 11:06 +0100
              Re: How to use a struct with qsort()? Manfred <noname@invalid.add> - 2019-10-26 16:58 +0200
                Re: How to use a struct with qsort()? DFS <nospam@dfs.com> - 2019-10-26 18:17 -0400
                Re: How to use a struct with qsort()? Keith Thompson <kst-u@mib.org> - 2019-10-26 16:08 -0700
                Re: How to use a struct with qsort()? DFS <nospam@dfs.com> - 2019-10-26 21:33 -0400
                Re: How to use a struct with qsort()? Keith Thompson <kst-u@mib.org> - 2019-10-26 22:10 -0700
                Re: How to use a struct with qsort()? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2019-10-27 01:48 +0100
                Re: How to use a struct with qsort()? Manfred <noname@invalid.add> - 2019-10-27 19:29 +0100
                Re: How to use a struct with qsort()? Barry Schwarz <schwarzb4aarp@gmail.com> - 2019-10-27 13:09 -0700

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