be.scm

(define (game min max)
  (let* ((guess (floor (/ (+ min max) 2)))
        (hl (begin (format #t "is your number ~a?\n(h)igher/(l)ower/(c)orrect: " guess) (read))))
    (cond
     ((eq? hl 'h) (game guess max))
     ((eq? hl 'l) (game min guess))
     ((eq? hl 'c) (format #t "I win!\n"))
     (else (game min max)))))
(game 0 100)