From: Christopher Dimech <dimech@gmx.com>
To: Nick Dokos <ndokos@gmail.com>
Cc: help-gnu-emacs@gnu.org
Subject: Re: Executing part of the code instead of another
Date: Wed, 7 Oct 2020 20:01:31 +0200 [thread overview]
Message-ID: <trinity-a589dfe9-2bc4-4611-98eb-08aa8dc511e8-1602093691086@3c-app-mailcom-bs01> (raw)
In-Reply-To: <87pn5uvtaj.fsf@alphaville.usersys.redhat.com>
Noted Nick. Thank you.
---------------------
Christopher Dimech
Chief Administrator - Naiad Informatics - GNU Project (Geocomputation)
- Geophysical Simulation
- Geological Subsurface Mapping
- Disaster Preparedness and Mitigation
- Natural Resource Exploration and Production
- Free Software Advocacy
> Sent: Wednesday, October 07, 2020 at 7:29 PM
> From: "Nick Dokos" <ndokos@gmail.com>
> To: help-gnu-emacs@gnu.org
> Subject: Re: Executing part of the code instead of another
>
> Christopher Dimech <dimech@gmx.com> writes:
>
> > I have tried executing the following condition (if (nb > na))
> >
> > (setq na 2)
> > (setq nb 5)
> > ( if (> nb na)
> > (message "nb > na [condition true]")
> > (message "condition false")
> > )
> >
> > I highlighted the region then pressed C-x C-e
> > It returned the first message as expected, but when I tried
> > the next one, I still got the first message.
> >
> `C-x C-e` is bound to `eval-last-sexp` which evaluates the *last*
> sexp: the if. It does not evaluate the setq's (setting the region does
> *NOT* matter for it - try `M-x eval-region' for that)
>
>
> > (setq na 2)
> > (setq nb 1)
> > ( if (> nb na)
> > (message "nb > na [condition true]")
> > (message "condition false")
> > )
> >
> >
> >
> >
> >> Sent: Wednesday, October 07, 2020 at 9:20 AM
> >> From: "Robert Pluim" <rpluim@gmail.com>
> >> To: "Christopher Dimech" <dimech@gmx.com>
> >> Cc: moasenwood@zoho.eu, help-gnu-emacs@gnu.org
> >> Subject: Re: Executing part of the code instead of another
> >>
> >> >>>>> On Wed, 7 Oct 2020 09:01:00 +0200, Christopher Dimech <dimech@gmx.com> said:
> >>
> >> Christopher> What can one use if there is an else branch with multiple commands, as I would
> >> Christopher> like to use it.
> >>
> >> From 'C-h f if'
> >>
> >> if is a special form in `C source code'.
> >>
> >> (if COND THEN ELSE...)
> >>
> >> Probably introduced at or before Emacs version 1.1.
> >>
> >> If COND yields non-nil, do THEN, else do ELSE...
> >> Returns the value of THEN or the value of the last of the ELSE's.
> >> => THEN must be one expression, but ELSE... can be zero or more expressions.
> >> If COND yields nil, and there are no ELSE's, the value is nil.
> >>
> >>
> >> Robert
> >> --
> >>
> >
> >
>
> --
> Nick
>
> "There are only two hard problems in computer science: cache
> invalidation, naming things, and off-by-one errors." -Martin Fowler
>
>
>
next prev parent reply other threads:[~2020-10-07 18:01 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-07 0:19 Executing part of the code instead of another Christopher Dimech
2020-10-07 0:50 ` Emanuel Berg via Users list for the GNU Emacs text editor
2020-10-07 0:55 ` Christopher Dimech
2020-10-07 1:05 ` Emanuel Berg via Users list for the GNU Emacs text editor
2020-10-07 7:01 ` Christopher Dimech
2020-10-07 7:13 ` Emanuel Berg via Users list for the GNU Emacs text editor
2020-10-07 7:20 ` Robert Pluim
2020-10-07 13:09 ` Christopher Dimech
2020-10-07 17:29 ` Nick Dokos
2020-10-07 18:01 ` Christopher Dimech [this message]
2020-10-07 9:38 ` Gregory Heytings via Users list for the GNU Emacs text editor
2020-10-07 9:46 ` Emanuel Berg via Users list for the GNU Emacs text editor
2020-10-07 9:53 ` Robert Pluim
2020-10-07 11:17 ` Emanuel Berg via Users list for the GNU Emacs text editor
2020-10-07 11:28 ` Robert Pluim
2020-10-07 13:28 ` Stefan Monnier
2020-10-07 13:40 ` Robert Pluim
2020-10-07 13:48 ` Christopher Dimech
2020-10-07 14:01 ` tomas
2020-10-07 14:05 ` Christopher Dimech
2020-10-08 17:43 ` Leo Butler
2020-10-07 15:15 ` Drew Adams
2020-10-18 23:02 ` Douglas Lewan
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