Mondo Bizarro

Mondo Bizarro

In this thread about a closure puzzler Jens posted Eugene Kohlbecker’s mind-bender called Mondo Bizarro.

;;; Mondo Bizarro
 
; What does the following program print?
; Why?
 
(define program (lambda ()
    (let ((y (call-with-current-continuation (lambda (c) c))))
         (display 1)
         (call-with-current-continuation (lambda (c) (y c)))
         (display 2)
         (call-with-current-continuation (lambda (c) (y c)))
         (display 3))))
 
 
(program)

Mondo Bizarro seems to have been originally published in ACM SIGPLAN Lisp Pointers, Volume 1, Issue 2 (June-July 1987), located here; but I could not confirm that.

Here is an implementation of it in Java.

(via the PLT Discussion List)

This was written by Grant. Posted on Sunday, January 18, 2009, at 4:26 pm. Filed under Link. Tagged Programming Language, Scheme. Bookmark the permalink. Follow comments here with the RSS feed. Post a comment or leave a trackback.

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