@ Nicolas and ajuc
Thank you very much for showing me where I went wrong! With so many
parentheses it sometimes happens that I misplace one
Now the output of the function is as expected:
(defn prefix->postfix [expr]
(if (coll? expr)
(let [ [op arg1 arg2] expr]
[ (prefix->postfix arg1) (prefix->postfix arg2) op]) ;; <--
removed on parenthesis here
expr))
(prefix->postfix '(+ 2 (* 3 2)))
;; --> [2 [3 2 *] +]
There is just one point I still don't quite understand. That is,
during one of the recursive calls, the expression (* 3 2) is passed as
an argument to prefix->postfix:
(prefix->postfix (* 3 2))
As prefix->postfix is a normal function and not a macro, (* 3 2)
should get evaluated BEFORE being passed to the function. However,
this is not the case here.
Could it be that because (* 3 2) is quoted, because the initial
argument to the function, '(+ 2 (* 3 2)), was quoted?
Could it be that because the initial argument to prefix->postfix, '(+
2 (* 3 2)), is quoted, (* 3 2) is also quoted and therefore does not
get evaluated?
Stefan
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