Quick and dirty code to test random distributions

RandomTest.cs

using System;
using System.Collections.Generic;

public class HelloWorld
{
    public static void Main(string[] args)
    {
        var random = new Random();
        var distribution = new Dictionary<int, int>();
        var SCALE = 1000;
        for (var i = 1; i <= 1000*SCALE; i++)
        {
            var rand = random.NextNormalInt(0, 10);
            var n = distribution.GetValueOrDefault(rand, 0);
            distribution[rand] = n+1;
        }
        for (var i = -30; i <= 30; i++)
        {
            var n = distribution.GetValueOrDefault(i, 0) / SCALE;
            Console.WriteLine(new String('|', n));
        }
    }
}



public static class RandomExtensions
{
	public static int NextNormalInt(this Random random, float mean = 0, float standardDeviation = 1)
	{
		var normalFloat = random.NextNormalFloat(mean, standardDeviation);
		var normalInt = (int)Math.Round((double)normalFloat);
		return normalInt;
	}
	
	// https://stackoverflow.com/a/218600/6702274
	public static float NextNormalFloat(this Random random, float mean = 0, float standardDeviation = 1)
	{
		var u1 = 1 - random.NextDouble();
		var u2 = 1 - random.NextDouble();
		var randNormal = Math.Sqrt(-2.0 * Math.Log(u1)) * Math.Sin(2.0 * Math.PI * u2);
		return mean + standardDeviation * (float)randNormal;
	}
}