Greatest Common Divisor
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(mod (num1 num2) (defun remainder (x y) (r (divmod x y))) (defun gcd (num1 num2) (if (= num2 0) num1 (gcd num2 (remainder num1 num2)))) (gcd num1 num2) )
Example Usage
brun '(a (q 2 4 (c 2 (c 5 (c 11 ())))) (c (q (a (i (= 11 ()) (q . 5) (q 2 4 (c 2 (c 11 (c (a 6 (c 2 (c 5 (c 11 ())))) ()))))) 1) 6 (divmod 5 11)) 1))' '(99 33)'
33
brun '(a (q 2 4 (c 2 (c 5 (c 11 ())))) (c (q (a (i (= 11 ()) (q . 5) (q 2 4 (c 2 (c 11 (c (a 6 (c 2 (c 5 (c 11 ())))) ()))))) 1) 6 (divmod 5 11)) 1))' '(206 40)'
2