Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!chinacat!uudell!mustang!jrh
From: jrh@mustang.dell.com (James Howard)
Newsgroups: comp.lang.c
Subject: Re: Beginning C question.
Message-ID: <7703@uudell.dell.com>
Date: 24 Jul 90 04:09:14 GMT
References: <10997@chaph.usc.edu>
Sender: news@uudell.dell.com
Reply-To: jrh@mustang.dell.com (James Howard)
Organization: Dell Computer Corp.
Lines: 36

In article <10997@chaph.usc.edu>, wsze@nunki.usc.edu (Wally "The Whale"
Sze) writes:
> I have a (beginning C) problem with a program I am working on. My
> compiler uses 16-bit ints, and I need to read some 32bit long ints
> from disk. 
> 
> (as a background, I wrote the same program for unix, and it worked
> fine when I used getw(), but on my home compiler it doesn't.. getw()
> returns only 16 bits).
> 
> A way I can see to solve this is to read two ints from disk and
> concantenate them. But how do you concantenate ints? Say I have
> a = 0x20df and b = 0x3244, and want to get a long int 0x20df3244.
> If anyone can help, or if you can think of a better way to do this,
> please let me know by mail. Thank you.

This works on my system:

main()
{
        short a=0x20df;
        short b=0x3244;
        int   c;

c = (a<<16) + b;
printf("c = %x\n",c);

exit(0);
}

I used "short" because they're 16 bits on this machine, and int's are 32.


James Howard        Dell Computer Corp.        !'s:uunet!dell!mustang!jrh
(512) 343-3480      9505 Arboretum Blvd        @'s:jrh@mustang.dell.com
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