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  1. (defun help-func (n list)
  2. 	(cond
  3. 		((= n 1) (car list))
  4. 		(T (help-func (1- n) (cdr list)))))
  5.  
  6. (defun no-nth (n list)
  7. 	(cond
  8.  		((or (< n 0) (>= n (length list))) 'invalid-index)
  9. 		(T (help-func n list))))
  10.  
  11. (print (no-nth 2 '(1 6 7)))
  12. (print (no-nth 21 '(1 2 3)))
Success #stdin #stdout 0.02s 10584KB
comments (?)
stdin 
Standard input is empty
stdout 
6 
INVALID-INDEX
https://ideone.com/zW0gvD
language:
Common Lisp (clisp 2.49.92)
created:
11 years ago
visibility:
public

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