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letrec

Name: Anonymous 2011-12-23 12:06

Isn't

(letrec ([is-even? (lambda (n)

                    (or (zero? n)

                        (is-odd? (sub1 n))))]

         [is-odd? (lambda (n)

                   (and (not (zero? n))

                        (is-even? (sub1 n))))])

        (is-odd? 11))

equivalent to...

(let

    ([is-even? nil]

     [is-odd? nil])

    (set! is-even? (lambda (n)

                    (or (zero? n)

                        (is-odd? (sub1 n)))))

    (set! is-odd? (lambda (n)

                   (and (not (zero? n))

                        (is-even? (sub1 n)))))

    (is-odd? 11))

Name: >>2 2011-12-23 14:21

>>5
I'm not >>4. Give me three hours and I'll explain you everything you need to know about call/cc.

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letrec

1 Name: Anonymous 2011-12-23 12:06

6 Name: >>2 2011-12-23 14:21

Name: Anonymous 2011-12-23 12:06

Name: >>2 2011-12-23 14:21