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  1. (defun sum_digits (x)
  2.     (if (= x 0)
  3.         0
  4.         (+ (mod x 10) (sum_digits (truncate (/ x 10))))))
  5.  
  6. (print (sum_digits (expt 2 1000)))
Success #stdin #stdout 0.03s 10944KB
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https://ideone.com/0V9xwD
language:
Common Lisp (clisp 2.49.92)
created:
11 years ago
visibility:
public

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