MESSAGE
| DATE | 2002-04-24 |
| FROM | Jon Bober
|
| SUBJECT | Re: [hangout] C problem
|
From owner-hangout-desteny-at-mrbrklyn.com Wed Apr 24 13:31:46 2002
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Date: Wed, 24 Apr 2002 13:27:01 -0400
From: Jon Bober
To: hangout-at-nylxs.com
Cc: ruben-at-mrbrklyn.com
Subject: Re: [hangout] C problem
Message-ID: <20020424172701.GA11814-at-gandalf.nyu.edu>
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The value -1 results in "true." The only value that results in "false"
is 0.
The C statement:
if(x)
is something similar to the assembler statement
cmp 0, x
Basically, if(x) means if(x!=0)
On Wed, Apr 24, 2002 at 09:59:29AM -0400, Ruben I Safir wrote:
>
> Yes
>
> That's right, but it still doesn't work and I'm not
> sure why. When you send CTL D the scanf returns a -1, which I asume is the
> EOF result, and the if statement doesn't break.
>
>
> This is why I use Perl
>
>
> Ruben
>
> > Wow. I feel really stupid. I don't know how that happened. I guess I
> > was looking at the warnings.
> >
> > I think that the problem is one of operator precedence. try:
> > if (!(ret=scanf("%255s", buff_key)))
> >
> > I just tested the two lines
> > z = (!y=x);
> >
> > and
> > z = (!(y=x));
> >
> > The latter works but not the former. The first is trying to assign the
> > value x to !y
> >
> > On Wed, 24 Apr 2002 01:20:19 -0400 (EDT)
> > Ruben I Safir wrote:
> >
> > >
> > > > First, what is g_hash_table_new(), if those warnings are important
> > > > to you?
> > > >
> > >
> > > ITs a gtk function which has nothing to do with the problem
> > >
> > >
> > > > Second, hTable must be declared
> > >
> > >
> > > Yahah yadah - it's declared above main where it belongs
> > >
> > > The error is the lvalue
> > > int ret and scanf
> > >
> > > THIS is the line which is the problem
> > >
> > > > > if(! ret=scanf("%255s", buff_key)) break; <====LINE 35
> > > > > hash.c:35: invalid
> > > > > lvalue in assignment
> > > > >
> > > > > --
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> >
>
> ____________________________
> New Yorker Linux Users Scene
> Fair Use -
> because it's either fair use or useless....
____________________________
New Yorker Linux Users Scene
Fair Use -
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