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From: gwyn@brl-tgr.ARPA (Doug Gwyn <gwyn>)
Newsgroups: net.unix-wizards
Subject: Re: Need help with C
Message-ID: <2117@brl-tgr.ARPA>
Date: Fri, 31-Jan-86 17:33:03 EST
Article-I.D.: brl-tgr.2117
Posted: Fri Jan 31 17:33:03 1986
Date-Received: Mon, 3-Feb-86 05:20:01 EST
References: <9294@ritcv.UUCP>
Organization: Ballistic Research Lab
Lines: 39

>     I'm having some problems with structures in a C program I've been
>     writing.  I have a structure declared as follows:
> 
>     struct datestruct
>       {
> 	char month, day, year;
>       }
> 
>     Further on I have a structure declared:
> 
>     struct dbstruct
>       {
> 	double ...
> 	struct datestruct date;
>       }
> 
>     and the declarations:
> 
>     struct datestruct date;
>     struct dbstruct dbase[63];
> 
>     I try to do a comparison between these, i.e.
> 
>         ( date == dbase[loop].date )
> 
>     but the compiler blows up on this, saying the two are incompatible.
>     I'm almost positive I've done this sort of thing before, and can't
>     seem to find why it won't work.  Anyone have any ideas/suggestions
>     as to why this is?

Struct comparison is not supported by C,
just assignment, passing or returning to/from functions,
and member selection.
You will have to compare the three elements individually
(or use memcmp(3C)).

>     Also, is there a better newsgroup for these type of inquiries?

net.lang.c (INFO-C)