2 files changed, 28 insertions, 0 deletions
diff --git a/Scala/sandbox/0-main.scala b/Scala/sandbox/0-main.scala
index 7a0b791..ee22e71 100644
--- a/Scala/sandbox/0-main.scala
+++ b/Scala/sandbox/0-main.scala
@@ -4,5 +4,6 @@ object Main extends App {
   Sqrt.run
   Recursion.run
   Curry.run
+  Rationals.run
 
 }
diff --git a/Scala/sandbox/3-rationals.scala b/Scala/sandbox/3-rationals.scala
new file mode 100644
index 0000000..387e091
--- /dev/null
+++ b/Scala/sandbox/3-rationals.scala
@@ -0,0 +1,27 @@
+
+object Rationals {
+
+  class Rational(x :Int, y: Int) {
+    def numer = x
+    def denom = y
+
+    def neg = new Rational(-numer, denom)
+
+    def add(that: Rational) =
+      new Rational(
+        numer * that.denom + that.numer * denom,
+        denom * that.denom)
+
+    def sub(that: Rational) = add(that.neg)
+
+    override def toString = numer + "/" + denom
+
+  }
+
+  def run = {
+    println("Rationals")
+    println(new Rational(2, 3).add(new Rational(3, 4)).toString)
+    println(new Rational(1, 3).sub(new Rational(5 ,7)).sub(new Rational(3, 2)).toString)
+  }
+
+}