challenge-bot.com Git - ozzloy@gmail.com/realm-of-racket-journey/blob - guess.rkt

   1 #! /usr/bin/env racket
   2 #lang racket/base
   3
   4 (define lower 1)
   5 (define upper 100)
   6
   7 (define (guess)
   8   (quotient (+ lower upper) 2))
   9
  10 (define (smaller)
  11   (set! upper (max lower (sub1 (guess))))
  12   (guess))
  13
  14 (define (bigger)
  15   (set! lower (min upper (add1 (guess))))
  16   (guess))