renamed directory to csharp. Moved algorithm to another file

chapters/monte_carlo/code/csharp/MonteCarlo.cs

@@ -0,0 +1,37 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace MonteCarlo
+{
+ class MonteCarlo
+ {
+ private static Random random = new Random(47);
+ private readonly int radius = 1;
+
+
+ public MonteCarlo(int radius)
+ {
+ this.radius = radius;
+ }
+
+
+ public double Run(int samples)
+ {
+ int piCount = 0;
+
+ for (int i = 0; i < samples; i++)
+ {
+ var randomX = random.NextDouble() * radius;
+ var randomY = random.NextDouble() * radius;
+
+ if (IsInCircle(randomX, randomY)) piCount++;
+ }
+
+ return 4 * piCount / (double)samples;
+ }
+
+
+ private bool IsInCircle(double x, double y) => x * x + y * y < radius * radius;
+ }
+}

chapters/monte_carlo/code/csharp/Program.cs

@@ -0,0 +1,17 @@
+using System;
+
+namespace MonteCarlo
+{
+ class Program
+ {
+ public static void Main(string[] args)
+ {
+ double piEstimate = new MonteCarlo(1).Run(1000000);
+
+ Console.WriteLine("Pi estimate = {0}", piEstimate);
+ Console.WriteLine("Pi error = {0}", 100 * (Math.Abs(Math.PI - piEstimate)) / Math.PI);
+
+ Console.ReadLine();
+ }
+ }
+}