Not Lisp again (2009)

Re:Not Lisp again (2009) by vats on Monday March 01, 2021 @03:17AM (#26300631)

SICP language in racket lacks 1+ and -1+ (increment and decrement), last I checked. So it does still need some modification.

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Re:Not Lisp again (2009) by soegaard on Monday March 01, 2021 @07:18AM (#26302028)

Are those actually used in the book?

But if needed, the user can write:

    (define (1+ x) (+ x 1))
    (define (1- x) (- x 1))

Although, I think, add1 and sub1 are more common nowadays.

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Re:Not Lisp again (2009) by jgwil2 on Thursday March 11, 2021 @10:34AM (#26425083)

Pretty sure that example comes from the first edition. #lang sicp is made to work with the second edition I assume.

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