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                [TOC] ## trace 使用 trace 打印函數過程 ``` (require racket/trace) (define (dec a) (- a 1)) (define (inc a) (+ a 1)) (define (plus a b) (if (= a 0) b (plus (dec a) (inc b)))) ;; 使用 trace 打印 trace 函數 (trace plus) (plus 3 5) ;;>(plus 3 5) ; >(plus 2 6) ; >(plus 1 7) ; >(plus 0 8) ; <8 ```
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