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1 files changed, 16 insertions, 0 deletions

diff --git a/coding-exercises/1/chapter116.rkt b/coding-exercises/1/chapter116.rkt
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index 0000000..e4f1e7d
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+++ b/coding-exercises/1/chapter116.rkt
@@ -0,0 +1,16 @@
+(define (square x) (* x x))
+
+(define (fast-expt b n)
+  (cond ((= n 0) 1)
+        ((even? n) (square (fast-expt b (/ n 2))))
+        (else (* b (fast-expt b (- n 1))))))
+
+(define (fie a b n)
+  (cond ((= n 0) a)
+        ((even? n) (fie a (square b) (/ n 2)))
+        (else  (fie (* a b) b (- n 1)))))
+
+(define (fast-expt b n)
+  (fie 1 b n))
+
+(fast-expt 5 5)