Need help

I have to do a program in lisp that Delete all circle that are rad

Is this for an assignment of some sort? - as, if it is, I'd rather step you through it, than just post the answer

It it's for school...... yes it is some sort of assignement.....

This should give you a decent starting point - just "uncomment" the method you wish to use

 ;  Function to Delete all Circles
 ;       with Radius < 100.

(defun c:DelCir  (/ ss)

 ; Define function and localise variables.
 ; We use "defun c:" to declare that the
 ; function can be called from the command line.
 ; The function syntax in this case is "DelCir".


 (if

 ; If we can retrieve a Selection Set of Circles

   (setq ss

 ; Set the Selection Set to a variable "ss"

          (ssget "_X" ; Search Entire Database

                 '((0 . "CIRCLE") ; Filter Circles

                   (-4 . "<") ; Less than

                   (40 . 100) ; 100 Radius

                   ) ; End Filter List

                 ) ; End ssget

         ) ; End setq

   

    ;; There are Many ways to do the next bit... here are a few:

    ;; Method 1:

;;;     (foreach x ; for Every Entity in the following list
;;;
;;;                 (mapcar 'cadr ; Retrieve Entity Name
;;;
;;;                         (ssnamex ss) ; Retrieve Selection Set Information
;;;
;;;                         ) ; End mapcar
;;;
;;;       (entdel x) ; Delete Entity
;;;
;;;       ) ; End Foreach

   
;;;     ;; Method 2:

;;;     (command "_erase" ss "")


    ;; Method 3:

;;;    (vl-load-com)  ; Load VL functions
;;;    
;;;     (foreach x ; for Every Entity in the following list
;;;
;;;                 (mapcar 'vlax-ename->vla-object ; Convert Entity to VLA-object
;;;
;;;                         (mapcar 'cadr ; Retrieve Entity Name
;;;
;;;                                 (ssnamex ss) ; Retrieve SelSet info
;;;
;;;                                 ) ; end mapcar
;;;
;;;                         ) ; end mapcar
;;;
;;;       (if ; If the following returns T
;;;
;;;         (vl-catch-all-error-p ; If there is an error
;;;
;;;           (vl-catch-all-apply ; Apply the following, and return any Errors
;;;
;;;             'vla-delete ; Delete function
;;;
;;;             (list x) ; VLA-object
;;;
;;;             ) ; end vl-catch-all-apply
;;;
;;;           ) ; end vl-catch-all-error-p
;;;
;;;          (princ "\nObject on Locked Layer!") ; if an Error Occurs, print this message
;;;
;;;          ) ; End if
;;;
;;;       ) ; end Foreach

    ;; --- End of Method 3  ---

    ) ; End Main IF statement


 (princ) ; Exit Cleanly

 ) ; End DelCir

wow tnx u .. ur a life saver:D

wow tnx u .. ur a life saver:D

No problem, btw, comments are anything after a semi-colon ( Also, Method 3 will deal with Locked Layers.