I am not sure whether this is a the right list to post this question. Else please let me know.
I run this in Dr. racket. #lang racket (define lower 1) (define upper 100) (define (guess) (quotient (+ lower upper) 2)) (define (smaller) (set! upper (max lower (guess (sub1 guess)))) (guess)) When i invoke the smaller function in the repl i get: Welcome to DrRacket, version 5.3.5--2013-06-18(-/f) [3m]. Language: racket; memory limit: 128 MB. > (smaller) . . sub1: contract violation expected: number? given: #<procedure:guess> > What am i doing wrong? - Jo
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