diff -r c616ec6b1e3c -r c603b27083f3 Fahad/Scala/Chapter5.sc
--- a/Fahad/Scala/Chapter5.sc	Wed Jan 21 12:32:17 2015 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,107 +0,0 @@
-
-package greeter
-
-object Chapter5 {
-  println("Welcome to the Scala worksheet")       //> Welcome to the Scala worksheet
-
-  /////////////////////////////////////////////////////////////////////////////
-  //   CHAPTER 5: FIRST-CLASS FUNCTIONS
-
-  /*
-  // Write a function to sumall integers between two given numbers a and b
-  def sumInts(a: Int, b: Int): Int =
-    if (a > b) 0 else a + sumInts(a + 1, b)
-
-  sumInts(1, 5)
-
-  //Write a function to sum the squares of all integers between two given numbers a and b
-  def square(x: Int): Int = x * x
-  def sumSquares(a: Int, b: Int): Int =
-    if (a > b) 0 else square(a) + sumSquares(a + 1, b)
-
-  square(5)
-
-  //Write a function to sum the powers 2n of all integers n between two given numbers a and b:
-  def powerOfTwo(x: Int): Int = if (x == 0) 1 else 2 * powerOfTwo(x - 1)
-  def sumPowersOfTwo(a: Int, b: Int): Int =
-    if (a > b) 0 else powerOfTwo(a) + sumPowersOfTwo(a + 1, b)
-
-  sumPowersOfTwo(2, 4)
-  */
-
-  /*
-  def sum(f: Int => Int, a: Int, b: Int): Int =
-    if (a > b) 0 else f(a) + sum(f, a + 1, b)
-
-  //def sumInts(a: Int, b: Int): Int = sum(id, a, b)
-  //def sumInts(a: Int, b: Int): Int = sum((x: Int) => x, a, b)
-  def sumInts(a: Int, b: Int): Int = sum(x => x, a, b)
-  //def sumSquares(a: Int, b: Int): Int = sum(square, a, b)
-  //def sumSquares(a: Int, b: Int): Int = sum((x: Int) => x * x, a, b)
-  def sumSquares(a: Int, b: Int): Int = sum(x => x * x, a, b)
-  def sumPowersOfTwo(a: Int, b: Int): Int = sum(powerOfTwo, a, b)
-  
-  def id(x: Int): Int = x
-	def square(x: Int): Int = x * x
-	*/
-	def powerOfTwo(x: Int): Int = if (x == 0) 1 else 2 * powerOfTwo(x - 1)
-                                                  //> powerOfTwo: (x: Int)Int
-  
-
-  // 5.2: Currying
-
-  def sum(f: Int => Int): (Int, Int) => Int = {
-    def sumF(a: Int, b: Int): Int =
-      if (a > b) 0 else f(a) + sumF(a + 1, b)
-    sumF
-  }                                               //> sum: (f: Int => Int)(Int, Int) => Int
-
-  def sumInts = sum(x => x)                       //> sumInts: => (Int, Int) => Int
-  def sumSquares = sum(x => x * x)                //> sumSquares: => (Int, Int) => Int
-  def sumPowersOfTwo = sum(powerOfTwo)            //> sumPowersOfTwo: => (Int, Int) => Int
-  
-  sumSquares(1,10) + sumPowersOfTwo(10,20)        //> res0: Int = 2096513
-  sum(x => x * x)(2,4)                            //> res1: Int = 29
-
-	// 5.3: Finding Fixed Points of Functions
-	
-	val tolerance = 0.001                     //> tolerance  : Double = 0.001
-	def isCloseEnough(x: Double, y: Double) = Math.abs((x-y) / x) < tolerance
-                                                  //> isCloseEnough: (x: Double, y: Double)Boolean
-	def fixedPoint(f: Double => Double)(firstGuess: Double) = {
-		def iterate(guess: Double): Double = {
-			val next = f(guess)
-			if (isCloseEnough(guess, next)) next
-			else iterate(next)
-		}
-		iterate(firstGuess)
-	}                                         //> fixedPoint: (f: Double => Double)(firstGuess: Double)Double
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-}