Lisp - Make a list with variable value

Question

I save the variable value (setf num (+ 4 5)) like this and I save the (setf str '("Hello")).

And then I want make a list like this (setq v '(num str)). However because of the single quote, it doesn't recognize it as a string and not working as expected.

how can i make a list with variable value?

(list num str) or cons it doesn't work .. how to use this function? — MinSeob Lim
– MinSeob Lim, Commented Feb 6, 2017 at 15:29
(list var1 var2) is the same as (cons var1 (cons var2 '())). What doesn't work? — Sylwester
– Sylwester, Commented Feb 6, 2017 at 15:32
I'm sorry to ask you further. but one more i want to ask question. i making this function. (f 3 4) (sum = 7) (f 'a 'b) (not num!) i try to (format nil "sum = ~D." x) but, my problem is how can i make use formatting in list? — MinSeob Lim
– MinSeob Lim, Commented Feb 6, 2017 at 15:47
You can just quote the elements you want to be literal: (list 'sim '= 7). IN place of 7 you can just put a variable or an expression. — Sylwester
– Sylwester, Commented Feb 6, 2017 at 15:56

sds · Accepted Answer · 2017-02-06 15:34:30Z

5

The special operator quote prevents evaluation of your variables.

You need to call a function (which evaluates its arguments), e.g., list:

(list num str)
==> (9 "Hello")

edited Feb 6, 2017 at 15:34

answered Feb 6, 2017 at 15:28

sds

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2 Comments

MinSeob Lim Over a year ago

Thank you. But could you please look at my comments on the above question?

sds Over a year ago

You are welcome. You should ask a separate question for each issue instead of starting a comment conversation.

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