/**
 * 1. Write a Scala code snippet that reverses the lines in a file (making the last line the first one, and so on).
 */
scala> import scala.io.Source
import scala.io.Source

scala> val source = Source.fromURL("http://www.gutenberg.org/cache/epub/4809/pg4809.txt", "UTF-8")
source: scala.io.BufferedSource = non-empty iterator

scala> source.getLines.toArray.reverse
res10: Array[String] = Array(*END THE SMALL PRINT! FOR PUBLIC DOMAIN EBOOKS*Ver.02/11/02*END*, "", express permission.], they hardware or software or any other related product without, used in any sales of Project Gutenberg eBooks or other materials be, Michael S. Hart.  Project Gutenberg is a TradeMark and may not be, when distributed free of all fees.  Copyright (C) 2001, 2002 by, [Portions of this eBook's header and trailer may be reprinted only, "", hart@pobox.com, software or other items, please contact Michael Hart at:, If you are interested in contributing scanning equipment or, "", "Project Gutenberg Literary Archive Foundation.", Money should be paid to the:, public domain materials, or royalty free copyright licenses., The Project gratefully accepts contributions of money, tim...
scala> 

/**
 * 2. Write a Scala program that reads a file with tabs, replaces each tab with spaces so that tab stops are at n-column boundaries, and writes the result to the same file.
 */
 
// File (with tabs)
/**
 * $ cat ~/Downloads/fileWithTabs.txt 
    a	b	c
    d	e	f
 */
scala> val tabPattern = """\t""".r
tabPattern: scala.util.matching.Regex = \t

scala> val source = Source.fromFile("/Users/harit/Downloads/fileWithTabs.txt")
source: scala.io.BufferedSource = non-empty iterator

scala> val lines = source.getLines.toArray
lines: Array[String] = Array(a	b	c, d	e	f)

scala> lines(0)
res13: String = a	b	c

scala> import java.io.PrintWriter
import java.io.PrintWriter

scala> val out = new PrintWriter("/Users/harit/Downloads/fileWithTabs.txt")
out: java.io.PrintWriter = java.io.PrintWriter@106e6dfe

scala> for(line <- replacedLines) {out.println(line)}

scala> out.flush

scala> out.close

/**
 *“3. Write a Scala code snippet that reads a file and prints all words with more than 12 characters to the console. Extra credit if you can do this in a single line.
 */
scala> import scala.io.Source
import scala.io.Source

scala> Source.fromURL("http://www.gutenberg.org/cache/epub/4809/pg4809.txt", "UTF-8").mkString.split("\\s").filter(_.length > 12)
res7: Array[String] = Array(redistributing, Volunteers*****, council--Policy, Orange--Corrupt, government--Efforts, reform--Influence, Armenteros--Painful, retire--Secret, Philip--Ominous, persecution--Execution, Antwerp--Horrible, Protestants--Remonstrance, Titelmann--Obduracy, Philip--Council, Trent--Quarrel, envoys--Order, Netherlands--Opposition, measure--Reluctance, Spain--Violent, instructions--Remarkable, Orange--Apoplexy, Viglius--Temporary, Hopper--Departure, Cambray--Character, Archbishop--Egmont, Spain--Flattery, bribery--Council, Doctors--Vehement, --Proceedings, principality--Egmont's, persecution--Indignation, Egmont--Habitual, dissimulation, King--Reproof, Orange--Assembly, Brussels--Result, deliberations, Philip--Universal, Netherlands--New, heretics--Interview, subject-...
scala> 

/**
 * 4. Write a Scala program that reads a text file containing only floating-point numbers. Print the sum, average, maximum, and minimum of the numbers in the file.
 */
scala> import scala.io.Source
import scala.io.Source

scala> val numbers = Source.fromFile("/Users/harit/Downloads/floating.txt", "UTF-8").getLines.map(_.toDouble).toArray
numbers: Array[Double] = Array(3.14, 2.34, 1.54, 8.34)

scala> numbers.min
res9: Double = 1.54

scala> numbers.max
res10: Double = 8.34

scala> numbers.sum
res11: Double = 15.36

scala> numbers.sum/numbers.size
res12: Double = 3.84

 /**
  * 5. Write a Scala program that writes the powers of 2 and their reciprocals to a file, with the exponent ranging from 0 to 20. Line up the columns:
  1      1
  2      0.5
  4      0.25
...      ...
*/
scala> val out = new java.io.PrintWriter("out.txt")
out: java.io.PrintWriter = java.io.PrintWriter@259aec72

scala> for (i <- 0 to 20) {
     | val pow = scala.math.pow(2, i)
     | out.println(pow + "\t" + 1/pow)
     | }

scala> out.close

scala> 
/**
 * $ cat out.txt 
1.0	1.0
2.0	0.5
4.0	0.25
8.0	0.125
16.0	0.0625
32.0	0.03125
64.0	0.015625
128.0	0.0078125
256.0	0.00390625
512.0	0.001953125
1024.0	9.765625E-4
2048.0	4.8828125E-4
4096.0	2.44140625E-4
8192.0	1.220703125E-4
16384.0	6.103515625E-5
32768.0	3.0517578125E-5
65536.0	1.52587890625E-5
131072.0	7.62939453125E-6
262144.0	3.814697265625E-6
524288.0	1.9073486328125E-6
1048576.0	9.5367431640625E-7
*/

// skipping 6-10