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| From | John Gordon <gordon@panix.com> |
|---|---|
| Newsgroups | comp.lang.c |
| Subject | Re: qsort |
| Date | 2011-11-11 15:20 +0000 |
| Organization | PANIX Public Access Internet and UNIX, NYC |
| Message-ID | <j9jefb$9ag$1@reader1.panix.com> (permalink) |
| References | <4ebd2a87$0$19698$bbae4d71@news.suddenlink.net> |
In <4ebd2a87$0$19698$bbae4d71@news.suddenlink.net> "Bill Cunningham" <nospam@nspam.invalid> writes:
> Seeing that in that last paramter of qsort and int is returned I guess
> you could pass NULL to that parameter. Would you want to do that.
No, you would not want to pass NULL. The purpose of that parameter is so
you can pass a pointer to a function that compares two of your data
elements. If you pass NULL, qsort has no way to compare the elements.
> ... what kind of function would I want to write to pass to that last
> parameter of qsort?
If you knew the parameter was for passing in a comparison function, why did
you ask about passing NULL?
--
John Gordon A is for Amy, who fell down the stairs
gordon@panix.com B is for Basil, assaulted by bears
-- Edward Gorey, "The Gashlycrumb Tinies"
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qsort "Bill Cunningham" <nospam@nspam.invalid> - 2011-11-11 09:00 -0500
Re: qsort Malcolm McLean <malcolm.mclean5@btinternet.com> - 2011-11-11 06:56 -0800
Re: qsort Ben Bacarisse <ben.usenet@bsb.me.uk> - 2011-11-11 16:39 +0000
Re: qsort 88888 Dihedral <dihedral88888@googlemail.com> - 2011-11-12 10:19 -0800
Re: qsort John Gordon <gordon@panix.com> - 2011-11-11 15:20 +0000
Re: qsort "Bill Cunningham" <nospam@nspam.invalid> - 2011-11-11 14:22 -0500
Re: qsort pete <pfiland@mindspring.com> - 2011-11-11 20:27 -0500
Re: qsort "Bill Cunningham" <nospam@nspam.invalid> - 2011-11-12 19:10 -0500
Re: qsort Keith Thompson <kst-u@mib.org> - 2011-11-12 16:40 -0800
Re: qsort "Bill Cunningham" <nospam@nspam.invalid> - 2011-11-13 01:39 -0500
Re: qsort Ian Collins <ian-news@hotmail.com> - 2011-11-13 19:51 +1300
Re: qsort Phil Carmody <thefatphil_demunged@yahoo.co.uk> - 2011-11-14 02:14 +0200
Re: qsort Nick Keighley <nick_keighley_nospam@hotmail.com> - 2011-11-14 00:43 -0800
Re: qsort pete <pfiland@mindspring.com> - 2011-11-12 22:42 -0500
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