1+ using System ;
2+ using System . Collections ;
3+ using System . Collections . Generic ;
4+ using System . Linq ;
5+ using System . Text . RegularExpressions ;
6+ using System . Xml . Linq ;
7+ using NUnit . Framework ;
8+ // Task 6
9+ // Write a program calculate average words length
10+ namespace CodingInterview
11+ {
12+ public class Class6
13+ {
14+ 15+ private static string RemoveSpecialCharacters ( string message )
16+ {
17+ Regex regex = new Regex ( "[^a-zA-Z0-9 ]" ) ;
18+ return regex . Replace ( message , "" ) ;
19+ }
20+ 21+ private static double AverageWordsLength ( string message )
22+ {
23+ var messageWithoutSpecialCharacters = RemoveSpecialCharacters ( message ) ;
24+ var words = messageWithoutSpecialCharacters . Split ( ' ' ) ;
25+ var wordLengthSum = 0 ;
26+ foreach ( var word in words )
27+ {
28+ wordLengthSum = wordLengthSum + word . Length ;
29+ }
30+ var response = ( double ) wordLengthSum / words . Length ;
31+ return Math . Round ( response , 2 ) ;
32+ }
33+ 34+ 35+ [ Test ]
36+ [ TestCase ( "Hi all, my name is Tom...I am originally from Australia." , 4.2 ) ]
37+ [ TestCase ( "I need to work very hard to learn more about algorithms in Python!" , 4.08 ) ]
38+ public void CheckAverageWordsLength ( string input , double expected_value )
39+ {
40+ Assert . AreEqual ( AverageWordsLength ( input ) , expected_value ) ;
41+ }
42+ 43+ }
44+ 45+ }
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