2009-06-03から1日間の記事一覧
;;;excercise2.79 ; tagをつける必要がなくなる (define (install-shceme-number-package2) (put 'add '(scheme-number scheme-number) (lambda (x y) (+ x y))) (put 'sub '(scheme-number scheme-number) (lambda (x y) (- x y))) (put 'mul '(scheme-numb…