From 6dac101d485b111e21dd77ec3eee726a7d93f2db Mon Sep 17 00:00:00 2001
From: michelou <michelou@epfl.ch>
Date: Thu, 4 Dec 2003 10:33:38 +0000
Subject: - adapted to new Scala compiler

---
 sources/examples/fors.scala | 43 ++++++++++++++++++++++++++++++++++++-------
 1 file changed, 36 insertions(+), 7 deletions(-)

(limited to 'sources/examples/fors.scala')

diff --git a/sources/examples/fors.scala b/sources/examples/fors.scala
index 55849f4010..cf22c2830e 100644
--- a/sources/examples/fors.scala
+++ b/sources/examples/fors.scala
@@ -1,8 +1,8 @@
-module fors {
+object fors {
 
-  trait Person {
-    val name: String;
-    val age: Int;
+  class Person(_name: String, _age: Int) {
+    val name = _name;
+    val age = _age;
   }
 
   def printOlderThan20(xs: Seq[Person]): Iterator[String] =
@@ -11,8 +11,13 @@ module fors {
   def printOlderThan20(xs: Iterator[Person]): Iterator[String] =
     for (val p <- xs; p.age > 20) yield p.name;
 
+  val persons = List(
+    new Person("John", 40),
+    new Person("Richard", 68)
+  );
+
   def divisors(n: Int): List[Int] =
-    for (val i <- List.range(1, n); n % i == 0) yield i;
+    for (val i <- List.range(1, n+1); n % i == 0) yield i;
 
   def isPrime(n: Int) = divisors(n).length == 2;
 
@@ -22,7 +27,7 @@ module fors {
          isPrime(i+j)) yield Pair(i, j);
 
   def sum(xs: List[Double]): Double =
-    (0.0 foldl_: xs) { (x, y) => x + y }
+    xs.foldLeft(0.0) { (x, y) => x + y }
 
   def scalProd(xs: List[Double], ys: List[Double]) =
     sum(for(val Pair(x, y) <- xs zip ys) yield x * y);
@@ -59,5 +64,29 @@ module fors {
 	 a1 == a2) yield Pair(a1, a2));
 
   def removeDuplicates[a](xs: List[a]): List[a] =
-    xs.head :: removeDuplicates(for (val x <- xs.tail; x != xs.head) yield x)
+    if (xs.isEmpty)
+      xs
+    else
+      xs.head :: removeDuplicates(for (val x <- xs.tail; x != xs.head) yield x);
+
+  def main(args: Array[String]) = {
+    Console.print("Persons over 20:");
+    printOlderThan20(persons) foreach { x => Console.print(" " + x) };
+    Console.println;
+
+    Console.println("divisors(34) = " + divisors(34));
+
+    Console.print("findNums(15) =");
+    findNums(15) foreach { x => Console.print(" " + x); };
+    Console.println;
+
+    val xs = List(3.5, 5.2);
+    Console.println("average(" + xs + ") = "
+      + sum(xs) / xs.length);
+
+    val ys = List(2.0, 1.0);
+    Console.println("scalProd(" + xs + ", " + ys +") = "
+      + scalProd(xs, ys));
+  }
+
 }
-- 
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