added csharp to md files, updated contributors

CONTRIBUTORS.md

@@ -40,3 +40,4 @@ GuyPozner
 <br>
 William Boyles
 <br>
+sanstorik

chapters/monte_carlo/code/csharp/MonteCarlo.cs

@@ -1,4 +1,5 @@
-using System;
+// submitted by vitalii shvetsov (@sanstorik)
+using System;
 using System.Collections.Generic;
 using System.Text;
 
@@ -7,31 +8,33 @@ namespace MonteCarlo
  class MonteCarlo
  {
  private static Random random = new Random(47);
- private readonly int radius = 1;
+ private int Radius { get; set; }
+ private int Samples { get; set; }
 
 
- public MonteCarlo(int radius)
+ public MonteCarlo(int radius = 1, int samples = 1000000)
  {
- this.radius = radius;
+ Radius = radius;
+ Samples = samples;
  }
 
 
- public double Run(int samples)
+ public double Run()
  {
  int piCount = 0;
 
- for (int i = 0; i < samples; i++)
+ for (int i = 0; i < Samples; i++)
  {
- var randomX = random.NextDouble() * radius;
- var randomY = random.NextDouble() * radius;
+ var randomX = random.NextDouble() * Radius;
+ var randomY = random.NextDouble() * Radius;
 
  if (IsInCircle(randomX, randomY)) piCount++;
  }
 
- return 4 * piCount / (double)samples;
+ return 4 * piCount / (double)Samples;
  }
 
 
- private bool IsInCircle(double x, double y) => x * x + y * y < radius * radius;
+ private bool IsInCircle(double x, double y) => x * x + y * y < Radius * Radius;
  }
 }

chapters/monte_carlo/code/csharp/Program.cs

@@ -1,12 +1,13 @@
 using System;
 
+// submitted by vitalii shvetsov (@sanstorik)
 namespace MonteCarlo
 {
  class Program
  {
  public static void Main(string[] args)
  {
- double piEstimate = new MonteCarlo(1).Run(1000000);
+ double piEstimate = new MonteCarlo(1, 1000000).Run();
 
  Console.WriteLine("Pi estimate = {0}", piEstimate);
  Console.WriteLine("Pi error = {0}", 100 * (Math.Abs(Math.PI - piEstimate)) / Math.PI);

chapters/monte_carlo/monte_carlo.md

@@ -59,8 +59,11 @@ each point is tested to see whether it's in the circle or not:
 [import:13-15, lang:"java"](code/java/MonteCarlo.java)
 {% sample lang="swift" %}
 [import:21-25, lang:"swift"](code/swift/monte_carlo.swift)
+{% sample lang="csharp" %}
+[import:37-39, lang:"csharp"](code/csharp/MonteCarlo.cs)
 {% endmethod %}
 
+
 If it's in the circle, we increase an internal count by one, and in the end,
 
 $$
@@ -123,6 +126,8 @@ Feel free to submit your version via pull request, and thanks for reading!
 {% sample lang="swift" %}
 ### Swift
 [import, lang:"swift"](code/swift/monte_carlo.swift)
+### CSharp
+[import, lang:"csharp"](code/csharp/MonteCarlo.cs)
 {% endmethod %}