1 files changed, 21 insertions, 0 deletions
diff --git a/test/files/pos/sqrt.scala b/test/files/pos/sqrt.scala
new file mode 100644
index 0000000000..f6a53824b4
--- /dev/null
+++ b/test/files/pos/sqrt.scala
@@ -0,0 +1,21 @@
+module test {
+
+  def abs(x: Double) = if (x >= 0) x else 0 - x;
+
+
+  def square(x: Double) = x * x;
+
+  def sqrt(x: Double) = {
+    def sqrtIter(guess: Double): Double =
+      if (isGoodEnough(guess)) guess
+      else sqrtIter(improve(guess));
+
+    def improve(guess: Double) =
+      (guess + x / guess) / 2;
+
+    def isGoodEnough(guess: Double) =
+      abs(square(guess) - x) < 0.001;
+
+    sqrtIter(1.0);
+  }
+}
+\ No newline at end of file