NetNews Offline 2/NetNews Offline Volume 2.iso/news/comp/lang/c-part1/27

Internet Message Format | 1996-08-05 | 1.5 KB

Path: colossus.holonet.net!tglbbs!charles.herold
From: [e-mail] (Charles Herold)
Newsgroups: comp.lang.c
Subject: switching array pointers query
Date: Sun, 31 Dec 1995 16:48:23 GMT
Message-ID: <[e-mail]>
Organization: TGL BBS 3 Nodes of Fun 212-974-3925, 212-765-2524, 212-541-5596
Distribution: world

My struggle with arrays of pointers and such not continues, and here's
an example of my difficulties.  Below is a bit of code that works, after
trying various ways that didn't work.  However, it doesn't do what I
want quite the way I intended.  I have an array of pointers to
structures, and wish to simply reverse the order of the array.  What I
*want* is to simply change what the pointers point to, that is, the
first pointer points to what begins as the last element of the array,
the last points to the first, and so on.  But I couldn't get that, and
you see below that I am simply moving the information in the last
element into where the first pointer is pointing etc.  Since it
does work, it might seem like I could just not worry about it.  But I'm
hoping seeing how this should be done might give me an understanding
breakthrough on this whole pointer to array thing that drives me crazy.

Thanks to all who help.

void
ReverseFiles( struct find_t **files, int numberfiles )
{
    int i, h;
    struct find_t temp;

    for( i = 0, h = numberfiles - 1; i < h; i++, h-- ) {
         temp = (*files)[i];
         (*files)[i] = (*files)[h];
         (*files)[h] = temp;
    }
}