Scala

1 files changed, 24 insertions, 0 deletions

diff --git a/gcd.scala b/gcd.scala
new file mode 100644
index 0000000..69f86a6
--- /dev/null
+++ b/gcd.scala
@@ -0,0 +1,24 @@
+/*
+ Synopsis:
+ 
+ # scalac gcd.scala
+ # scala gcd 11 22 33 121
+
+ // prints 11
+
+*/
+object gcd {
+    def gcd2(a: Int, b: Int): Int = b match {
+        case 0 => a
+        case _ => gcd2(b, a % b)
+    }
+
+    def main(args: Array[String]) {
+        try {
+            val numbers = args map Integer.parseInt
+            println(numbers.foldRight(0)((a, b) => gcd2(a, b)))
+        } catch {
+           case e: NumberFormatException => println("Not a number")
+        }
+    }
+}