Solutions to 4.27, 4.28 and 4.29.

[sicp.git] / src / sicp / utils.clj

diff --git a/src/sicp/utils.clj b/src/sicp/utils.clj
index f5c3e9c6f04397a2466d1b7dc9760ad1d41e4ed1..516b0141eba9306c16ded1167c800cb8d5407110 100644 (file)
--- a/src/sicp/utils.clj
+++ b/src/sicp/utils.clj
@@ -39,6 +39,12 @@
   (/ (reduce + coll)
      (float (count coll))))
 
+(defn approx-equal [x y]
+  (< (abs (- x y)) 0.00001))
+
+(defn error [^String string]
+  (throw (Exception. string)))
+
 (defmacro microbench
   " Evaluates the expression n number of times, returning the average
     time spent in computation, removing highest and lowest values.