Casino

Main.cs

using System;
using System.Collections.Generic;
using System.Linq;

namespace ConsoleApplication1
{
    class Program
    {
        public static void Main()
        {
            const int tries = 10000;
            const double prize = 36D;
            const double propabilityOfSuccess = (1D / 37D);
            const double initialBet = 1D;
            var c = new Casino(prize, propabilityOfSuccess);
            var results=c.Run(initialBet, tries);
            foreach (var result in results)
            {
                Console.WriteLine(result.ToString());
            }
            Console.WriteLine("Total winning: "+results.Sum(r=>r.Winnings));
            Console.WriteLine("Number of bets: "+results.Sum(r=>r.NumberOfBets));
            Console.WriteLine("Max amount: "+results.Max(r=>r.Bet));
            Console.ReadKey();
        }

        class Casino
        {
            private readonly double prize;
            private readonly double p;
            private readonly Random rnd;
            public Casino(double prize, double propabilityOfSuccess)
            {
                this.prize = prize;
                p = propabilityOfSuccess;
                rnd = new Random();
            }
            public IEnumerable<Result> Run(double initalBet, int tries)
            {
                for (int i = 0; i < tries; i++)
                {
                    yield return Bet(new Result (i){Bet = initalBet, NumberOfBets = 0},0);
                }
            }
            private Result Bet(Result result,double sunkenCost)
            {
                var bet = result.Bet;
                result.NumberOfBets++;
                if (Draw())
                {
                    result.Winnings = (bet*prize) - (bet + sunkenCost);
                    return result;
                }
                result.Bet = (bet * prize) / (prize - 1);
                return Bet(result, sunkenCost + bet);
            }
            private bool Draw()
            {
                return rnd.NextDouble() < p;
            }
        }

        class Result
        {
            public Result(int index)
            {
                Index = index;
            }

            private int Index { get; set; }
            public double Winnings { get; set; }
            public int NumberOfBets { get; set; }
            public double Bet { get; set; }
            public override string ToString()
            {
                return string.Format("{0}: {1}{2}{3}", Index.ToString(), Winnings.ToString(), new string('.', NumberOfBets), Bet.ToString());
            }
        }
    }
}