Schemeらしい書き方も勉強しなきゃ。 (use srfi-1) (define (integer->list i) (letrec ((i->rl (^(i) (cons (modulo i 10) (if (< i 10) '() (i->rl (quotient i 10))))))) (reverse (i->rl i)))) (define (list->integer l) (define (shift-d n) (let loop…