Bye Hello World

NewWave.sln

@@ -1,4 +1,4 @@
-Microsoft Visual Studio Solution File, Format Version 12.00
+Microsoft Visual Studio Solution File, Format Version 12.00
 # Visual Studio 15
 VisualStudioVersion = 15.0.26124.0
 MinimumVisualStudioVersion = 15.0.26124.0

src/NewWave/NewWave.csproj

@@ -3,6 +3,7 @@
   <PropertyGroup>
     <OutputType>Exe</OutputType>
     <TargetFramework>netcoreapp2.1</TargetFramework>
+    <LangVersion>latest</LangVersion>
     <RuntimeIdentifiers>linux-x64;osx-x64;win-x64</RuntimeIdentifiers>
   </PropertyGroup>
 

src/NewWave/Program.cs

@@ -1,12 +1,33 @@
-using System;
+using System;
+using System.Linq;
 
 namespace AcidChicken.NewWave
 {
     class Program
     {
         static void Main(string[] args)
         {
-            Console.WriteLine("Hello World!");
+            #if CSHARP8
+            Random random = new ();
+            int step = default;
+            #else
+            var random = new Random();
+            var step = 0;
+            #endif
+            Span<char> message = stackalloc [] { '大', '石', '泉', 'す', 'き' };
+            do
+            {
+                var current = random.Next(message.Length);
+                Console.Write(message[current]);
+                if (current == step)
+                {
+                    if (++step == message.Length)
+                        break;
+                }
+                else
+                    step = 0;
+            } while (true);
+            Console.WriteLine();
         }
     }
 }