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2015-11-03から1日間の記事一覧

SICP 問題 2.85

(define (install-project-packege) (define (project x) (apply-generic 'project x)) (put 'project 'complex (lambda (x) (make-real (real-part x)))) (put 'project 'real (lambda (x) (let ((rational (inexact->exact x))) (make-rational (numerator…