Fixed nullable warnings and created a project folder for dotnet tests

Author: Undalevein

csharp/Clockhands.cs

@@ -0,0 +1,13 @@
+using System;
+public class AntiparallelClockHandsComputer
+{
+    public static void Main()
+    {
+        for (var i = 0; i < 11; i++)
+        {
+            var t = (43200 * i + 21600) / 11;
+            (var h, var m, var s) = (t / 3600, t / 60 % 60, t % 60);
+            Console.WriteLine("{0:00}:{1:00}:{2:00}", (h != 0 ? h : 12), m, s);
+        }
+    }
+}

csharp/ReifiedExample.cs

@@ -1,6 +1,6 @@
 public class Box<T>
 {
-    public T Value { get; set; }
+    public T? Value { get; set; }
 }
 
 public class ReifiedExample

csharp/TraditionalWordCounter.cs

@@ -10,7 +10,7 @@ static void Main(string[] args)
         {
             var counts = new SortedDictionary<string, int>();
             var wordRegex = new Regex(@"[\p{L}']+");
-            string line;
+            string? line;
             while ((line = Console.ReadLine()?.ToLower()) != null)
             {
                 foreach (Match match in wordRegex.Matches(line))

csharp/WordCounter.cs

@@ -21,7 +21,7 @@ static void Main(string[] args)
         }
         static IEnumerable<string> StandardInputLines()
         {
-            string line;
+            string? line;
             while ((line = Console.ReadLine()) != null)
             {
                 yield return line;

csharp/project/Program.cs

@@ -0,0 +1,31 @@
+using System;
+using System.Collections.Generic;
+using System.Text.RegularExpressions;
+using System.IO;
+using System.Linq;
+
+namespace Examples
+{
+    static class WordCounter
+    {
+        static void Main(string[] args)
+        {
+            Regex wordRegex = new Regex(@"[\p{L}']+");
+            StandardInputLines()
+            .SelectMany(line => wordRegex.Matches(line).Cast<Match>())
+            .Select(x => x.Value.ToLower())
+            .GroupBy(x => x)
+            .OrderBy(x => x.Key)
+            .ToList()
+            .ForEach(p => Console.WriteLine("{0} {1}", p.Key, p.Count()));
+        }
+        static IEnumerable<string> StandardInputLines()
+        {
+            string? line;
+            while ((line = Console.ReadLine()) != null)
+            {
+                yield return line;
+            }
+        }
+    }
+}

csharp/project/project.csproj

@@ -0,0 +1,10 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net9.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

csharp/test.ps1

@@ -0,0 +1,44 @@
+function Assert-MatchTests {
+    param (
+        [Parameter(Mandatory = $true, ValueFromPipeline)] $TestResult
+    )
+
+    if ($TestResult) {
+        $TestResult
+        Write-Error "Output does not match expected results."
+    }
+}
+
+function Initialize-File {
+    param (
+        [Parameter(Mandatory = $true, ValueFromPipeline)] $FileName
+    )
+
+    Get-Content "$PSScriptRoot\$FileName" > "$PSScriptRoot\project\Program.cs"
+}
+
+# File path for the project folder.
+$project = "$PSScriptRoot\project"
+
+$Error.clear()
+    Initialize-File("Greeter.cs") && dotnet run --project $project &&
+    Initialize-File("ReifiedExample.cs") && dotnet run --project $project &&
+    Initialize-File("TraditionalWordCounter.cs") && Get-Content "$PSScriptRoot\..\test\wordcount_ascii_input" |
+        dotnet run --project $project |
+        Compare-Object (Get-Content "$PSScriptRoot\..\test\wordcount_ascii_expected") |
+        Assert-MatchTests &&
+    Initialize-File("Tripler.cs") && dotnet run --project $project |
+        Compare-Object (Get-Content "$PSScriptRoot\..\test\triple_expected") |
+        Assert-MatchTests &&
+    Initialize-File("WordCounter.cs") && Get-Content "$PSScriptRoot\..\test\wordcount_ascii_input" |
+        dotnet run --project $project |
+        Compare-Object (Get-Content "$PSScriptRoot\..\test\wordcount_ascii_expected") &&
+        # Assert-MatchTests &&
+ForEach-Object 'foo'
+
+if ($Error -or !$?) {
+    "*** C# TESTS FAILED ***"
+}
+else {
+    "C# TESTS PASSED"
+}