unlessを特殊形式で定義する． (define (analyze exp) (cond ((self-evaluating? exp) (analyze-self-evaluating exp)) ((quoted? exp) (analyze-quoted exp)) ((variable? exp) (analyze-variable exp)) ((assignment? exp) (analyze-assignment exp)) ((de…

;; 作用的順序のschemeで本文中のunlessを使用してfactorialを定義した時， ``(factorial 5)``を評価しようとすると何が起きるか. (define (unless condition usual-value exceptional-value) (if condition exceptional-value usual-value)) (define (facto…