Code
Here is an implementation of the recursive algorithm in Lisp:
(defun mc91 (n) (cond ((<= n 100) (mc91 (mc91 (+ n 11)))) (t (- n 10))))Here is an implementation of the recursive algorithm in C:
int mc91(int n) { if (n > 100) { return n - 10; } else { return mc91(mc91(n+11)); } }Here is an implementation of the non-recursive algorithm in C:
int mccarthy(int n) { int c; for (c = 1; c != 0; ) { if (n > 100) { n = n - 10; c--; } else { n = n + 11; c++; } } return n; }Read more about this topic: McCarthy 91 Function
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