--- a/Fahad/Scala/Chapter6.sc	Wed Jan 21 12:32:17 2015 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,69 +0,0 @@
-package greeter
-
-
-object Chapter6 {
-  println("Classes and Objects")                  //> Classes and Objects
-
-  class Rational(n: Int, d: Int) {
-    private def gcd(x: Int, y: Int): Int = {
-      if (x == 0) y
-      else if (x < 0) gcd(-x, y)
-      else if (y < 0) -gcd(x, -y)
-      else gcd(y % x, x)
-    }
-    private val g = gcd(n, d)
-
-    val numer: Int = n / g
-    val denom: Int = d / g
-    def +(that: Rational) = new Rational(numer * that.denom + that.numer * denom, denom * that.denom)
-    def -(that: Rational) = new Rational(numer * that.denom - that.numer * denom, denom * that.denom)
-    def *(that: Rational) = new Rational(numer * that.numer, denom * that.denom)
-    def /(that: Rational) = new Rational(numer * that.denom, denom * that.numer)
-
-    //Inheritance and Overriding
-    override def toString = "" + numer + "/" + denom
-    //Parameterless Methods
-    def square = new Rational(numer * numer, denom * denom)
-  }
-  //Inheritance and Overriding
-  var i = 1                                       //> i  : Int = 1
-  var x = new Rational(0, 1)                      //> x  : greeter.Chapter6.Rational = 0/1
-  while (i <= 10) {
-    x += new Rational(1, i)
-    i += 1
-  }
-  println("" + x.numer + "/" + x.denom)           //> 7381/2520
-  //Parameterless Methods
-  val r = new Rational(3, 4)                      //> r  : greeter.Chapter6.Rational = 3/4
-  println(r.square)                               //> 9/16
-
-  //Abstract Classes
-  abstract class IntSet {
-    def incl(x: Int): IntSet
-    def contains(x: Int): Boolean
-  }
-
-  //Triats
-  trait IntSett {
-    def incl(x: Int): IntSet
-    def contains(x: Int): Boolean
-  }
-
-  //Implementing abstract class
-  class EmptySet extends IntSet {
-    def contains(x: Int): Boolean = false
-    def incl(x: Int): IntSet = new NonEmptySet(x, new EmptySet, new EmptySet)
-  }
-
-  class NonEmptySet(elem: Int, left: IntSet, right: IntSet) extends IntSet {
-    def contains(x: Int): Boolean =
-      if (x < elem) left contains x
-      else if (x > elem) right contains x
-      else true
-    def incl(x: Int): IntSet =
-      if (x < elem) new NonEmptySet(elem, left incl x, right)
-      else if (x > elem) new NonEmptySet(elem, left, right incl x)
-      else this
-  }
-
-}