Dr Scheme Dr Scheme PLT Scheme Dr Scheme

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Dr. Scheme の使用 • Dr. Scheme の起動 プログラム　→ PLT Scheme → Dr. Scheme •

Dr. Scheme の使用 • Dr. Scheme の起動 プログラム　→ PLT Scheme → Dr. Scheme • 今日の演習では「Intermediate Student」 に設定 Language → Choose Language → Intermediate Student → Execute ボタン 10

フィボナッチ数 (define (fibo n) (cond [(= n 0) 0] [(= n 1) 1] [else

フィボナッチ数 (define (fibo n) (cond [(= n 0) 0] [(= n 1) 1] [else (+ (fibo (- n 1)) (fibo (- n 2)))])) 15

「反復的プロセス」でのフィボナッチ数 (define (fibo n) (fibo-iterate 1 0 n)) (define (fibo-iterate a b counter) (cond

「反復的プロセス」でのフィボナッチ数 (define (fibo n) (fibo-iterate 1 0 n)) (define (fibo-iterate a b counter) (cond [(= counter 0) b] [else (fibo-iterate (+ a b) a (- counter 1))])) 24

　 終了条件 (define (fibo-iterate a b counter) (cond a←a+b [(= counter 0) b] [else

　 終了条件 (define (fibo-iterate a b counter) (cond a←a+b [(= counter 0) b] [else (fibo-iterate (+ a b) a (- counter 1))])) b← a 27

(fibo 4) から 3 が得られる過程の概略 (fibo 4) =　(fibo-iterate 1 0 4) =　. . .

(fibo 4) から 3 が得られる過程の概略 (fibo 4) =　(fibo-iterate 1 0 4) =　. . . =　(fibo-iterate 1 1 3) =　. . . =　(fibo-iterate 2 1 2) =　. . . =　(fibo-iterate 3 2 1) =　. . . =　(fibo-iterate 5 3 0) =　. . . =　3 a, b, counter の 値が変化する 28

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