--- a/progs/bfi.scala	Thu Sep 26 12:59:33 2019 +0100
+++ b/progs/bfi.scala	Thu Sep 26 14:12:11 2019 +0100
@@ -1,16 +1,14 @@
 // An Interpreter for BF*** Programs
 //===================================
 
-
 import io.Source
 import scala.util._
 
-
 // loding a bf-file 
 def load_bff(name: String) : String = 
   Try(Source.fromFile(name)("ISO-8859-1").mkString).getOrElse("")
 
-
+// BF memory as a map
 type Mem = Map[Int, Int]
 
 // reading and writing BF memory
@@ -42,7 +40,7 @@
   }
 }
 
-
+// main interpreter loop
 def compute(prog: String, pc: Int, mp: Int, mem: Mem) : Mem = {
   if (0 <= pc && pc < prog.length) { 
     val (new_pc, new_mp, new_mem) = prog(pc) match {
@@ -67,7 +65,7 @@
 
 def run(prog: String, m: Mem = Map()) = compute(prog, 0, 0, m)
 
-
+// helper code for timing information
 def time_needed[T](n: Int, code: => T) = {
   val start = System.nanoTime()
   for (i <- 0 until n) code
@@ -75,12 +73,14 @@
   (end - start)/(n * 1.0e9)
 }
 
-
+// Testcases
+//===========
 
 // a Mandelbrot set generator in brainf*** written by Erik Bosman
 // (http://esoteric.sange.fi/brainfuck/utils/mandelbrot/)
+val b0 = load_bff("mandelbrot.bf")
 
-println(s"${time_needed(1, run(load_bff("mandelbrot.bf")))} secs")
+println(s"${time_needed(1, run(b0))} secs")
 
 
 // a benchmark program (counts down from 'Z' to 'A')