bench/vectors: add instructions on how to run the C# original code with dotnet run, format vectors.cs with dotnet format

bench/vectors/README.md

@@ -1,3 +1,22 @@
+Running the C# example:
+```
+dotnet run
+```
+
+Running the V program:
+```
+v crun vectors.v
+```
+
+Running the V program, compiled with -prod:
+```
+v -prod crun vectors.v
+```
+
+Note: the `crun` will make sure that the compilation will happen just
+once at the start, and then the executable will be just reused by the
+subsequent commands with identical options.
+
 ```bash
 Benchmark 1: ./boids_test/bin/Release/net7.0/linux-x64/publish/boids_test
 Time (mean ± σ):     262.2 ms ±   5.7 ms    [User: 231.6 ms, System: 14.1 ms]

bench/vectors/vectors.cs

@@ -1,3 +1,5 @@
+using System;
+
 internal readonly struct Vector
 {
     public readonly double X;
@@ -10,26 +12,27 @@ internal readonly struct Vector
         Y = y;
         Z = z;
     }
-    
+
     public override string ToString()
     {
         return $"({X}, {Y}, {Z})";
     }
 }
 
-internal static class Program
+
+class Program
 {
-    public static void Main()
+    static void Main(string[] args)
     {
         const int boidsCount = 10000;
-        
+
         var positions = new Vector[boidsCount];
         var velocities = new Vector[boidsCount];
 
         const double maxCoordinate = 10000.0;
 
         var random = new Random();
-        
+
         for (var positionIndex = 0; positionIndex < positions.Length; positionIndex++)
         {
             positions[positionIndex] = new Vector(
@@ -38,30 +41,30 @@ internal static class Program
                 z: random.NextDouble() * maxCoordinate
             );
         }
-        
+
         const double cohesionDistance = 10.0;
         const double separationDistance = 5.0;
 
         var closeBoids = new List<int>();
-        
+
         for (var boidIndex = 0; boidIndex < positions.Length; boidIndex++)
         {
             var position = positions[boidIndex];
             closeBoids.Clear();
-            
+
             for (var otherBoidIndex = 0; otherBoidIndex < positions.Length; otherBoidIndex++)
             {
                 if (boidIndex == otherBoidIndex)
                 {
                     continue;
                 }
-                
+
                 var otherPosition = positions[otherBoidIndex];
-                
+
                 var differenceX = position.X - otherPosition.X;
                 var differenceY = position.Y - otherPosition.Y;
                 var differenceZ = position.Z - otherPosition.Z;
-                
+
                 var distance = differenceX * differenceX +
                     differenceY * differenceY +
                     differenceZ * differenceZ;
@@ -112,20 +115,20 @@ internal static class Program
                 }
 
                 var closeBoidVelocity = velocities[closeBoidIndex];
-                
+
                 alignment = new Vector(
                     alignment.X + closeBoidVelocity.X,
                     alignment.Y + closeBoidVelocity.Y,
                     alignment.Z + closeBoidVelocity.Z
                 );
             }
-            
+
             cohesion = new Vector(
                 cohesion.X / closeBoids.Count,
                 cohesion.Y / closeBoids.Count,
                 cohesion.Z / closeBoids.Count
             );
-            
+
             var cohesionForce = new Vector(
                 cohesion.X - position.X,
                 cohesion.Y - position.Y,
@@ -140,7 +143,7 @@ internal static class Program
                     separation.Z / separationCount
                 );
             }
-            
+
             alignment = new Vector(
                 alignment.X / closeBoids.Count,
                 alignment.Y / closeBoids.Count,
@@ -148,7 +151,7 @@ internal static class Program
             );
 
             var currentVelocity = velocities[boidIndex];
-            
+
             velocities[boidIndex] = new Vector(
                 currentVelocity.X + cohesionForce.X + separation.X + alignment.X,
                 currentVelocity.Y + cohesionForce.Y + separation.Y + alignment.Y,
@@ -158,32 +161,33 @@ internal static class Program
 
         var positionSum = new Vector(0.0, 0.0, 0.0);
         var velocitySum = new Vector(0.0, 0.0, 0.0);
-        
+
         for (var boidIndex = 0; boidIndex < positions.Length; boidIndex++)
         {
             var position = positions[boidIndex];
             var velocity = velocities[boidIndex];
-            
+
             positions[boidIndex] = new Vector(
                 position.X + velocity.X,
                 position.Y + velocity.Y,
                 position.Z + velocity.Z
             );
-            
+
             positionSum = new Vector(
                 positionSum.X + position.X,
                 positionSum.Y + position.Y,
                 positionSum.Z + position.Z
             );
-            
+
             velocitySum = new Vector(
                 velocitySum.X + velocity.X,
                 velocitySum.Y + velocity.Y,
                 velocitySum.Z + velocity.Z
             );
         }
-        
+
         Console.WriteLine(positionSum.ToString());
         Console.WriteLine(velocitySum.ToString());
     }
 }
+

bench/vectors/vectors.csproj

@@ -0,0 +1,14 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+	<PublishSingleFile>true</PublishSingleFile>
+	<SelfContained>true</SelfContained>
+	
+    <TargetFramework>net7.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+	<OutputType>Exe</OutputType>
+  </PropertyGroup>
+
+</Project>

bench/vectors/vectors.runtimeconfig.json

@@ -0,0 +1 @@
+{"runtimeOptions":{"framework":{"name":"Microsoft.NETCore.App","version":"7.0.10"}}}