Problem in executing the code

[vignezds]

Hello Friends, Now I got some idea about Functions but I am not able to understand about macro's. For example here is a code:

Code: Select all

(defmacro reverse-list ( list )
    `(if (atom ,@list)
        ,@list 
      (reverse (mapcar #'reverse-list ,@list))))


`(reverse-list (list(1 2 3 4 5)))

I am not getting answer for this, what goes wrong here??, some one help me to sort out..

[logxor]

Pro tip—you have no hope of understanding your own macros without MACROEXPAND-1. Try expanding the call form:

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? (macroexpand-1 `(reverse-list (list(1 2 3 4 5))))
(IF (ATOM LIST (1 2 3 4 5))
    LIST
    (1 2 3 4 5)
    (REVERSE (MAPCAR #'REVERSE-LIST LIST (1 2 3 4 5))))

Comma-at-sign is the splicing operator, so the list being spliced loses its identity and gets absorbed into the outer form.

[vignezds]

Yes, as you said, I am very much new to this language, so kindly help me with some tutorials where I can find function example and corresponding macro

[porky11]

i think, you should read books. there are some good ones online for free (like the ones Paul Graham wrote). (the only lang i learnt this way)
But if you understand the basics it should often be enough to read the entrys for the operations in common lisp hyperspec, there also are many examples.

[logxor]

Try Essential Macro Definition.

[vignezds]

Thank You for your suggestion. 'll go through it.