Re: How to use a symbol and its value to create alist?

[Navy Cheng <navych@126.com>]

On Tue, Aug 11, 2015 at 08:21:53AM -0700, Ian Zimmerman wrote:
> On 2015-08-11 21:52 +0800, Navy Cheng wrote:
> 
> > (setq a 1)
> > (setq b 2)
> > (setq c 3)
> > 
> > How can I a alist, like:
> > ((a . 1) (b . 2) (c .3))
> > 
> > The value of a, b and c may change, so don't do this like
> > (setq tree ((a . 1) (b . 2) (c .3)))
> 
> That's a strange question.  Why would you want such a list, how would
> it be useful?  To look up the value a a symbol, you just use it, for
> example: 

I need to push some global variable to a "stack" and pop them later. If
I don't do like this, the global variables will be changed by program

> (setq a 1)
> 
> ...
> 
> (message "a=%d" a)
> 
> => a=1
> 
> In some special situations where a symbol is not evaluated (such as when
> playing with macros) you may need to use symbol-value.  But I'm guessing
> you're not at that point.
>

My question has been solved. What I want is

    (setq trees `((a . ,a) (b . ,b) (c . ,c)))

Thanks any way.