mutation 사용 (atom): ; (C) 2021 KIM Taegyoon ; Postfix Calculator (require 'clojure.string) (println "minicalc (C) 2021 KIM Taegyoon") (println "+ - * / expt sqrt") (defn check-num-op [stack n] (cond (< (count stack) n) (do (printf "Not enough operands. Required: %s. Given: %s.\n" n (count stack)) false) :else true)) (defn expt [a b] (Math/pow a b)) (defn calc [a] (try (let [stack (atom [])] (dos..