SMARTmania fórum

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let fibonacci = Seq.unfold (fun (current,next) -> Some(current, (next, current+next))) (0,1)

let sum =
    fibonacci    
    |> Seq.filter (fun x -> x% 2 = 0)
    |> Seq.takeWhile (fun x-> x<4000000)
    |> Seq.sum

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sing System;
using System.Reactive.Linq;


namespace FibonacciKata
{
  
  class Program
  {
    public const int LIMIT = 4000000;
    static void Main(string[] args)
    {      
      Observable.Generate(new
                            {
                              Previous = 1,
                              Current = 2,
                              Total = 0
                            },
                          state => state.Previous <= LIMIT,
                          state => new
                                     {
                                       Previous = state.Current,
                                       Current = state.Previous + state.Current,
                                       Total = state.Total + (state.Current % 2 == 0 ? state.Current : 0)
                                     },                          
                          state => state.Total)                          
                          .TakeLast(1)
                          .Subscribe(Console.WriteLine);

      Console.ReadLine();
    }

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    public static class Fibonacci
    {        
        public static IEnumerable<int> GetNumbers() 
        {
            yield return 0;

            int current = 1;
            int previous = 0;            

            while (true)
            {
                yield return current;                
                current += previous;
                previous = current - previous;
            }                  
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            int sum = Fibonacci.GetNumbers().Where(x => x % 2 == 1).TakeWhile(x => x < 4000000).Sum();
            Console.WriteLine(sum);                        
        }        
    }

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int sum = 0;
Stopwatch sw = new Stopwatch();
sw.Start();
int c = 2;
int t1, t2 = 1;
while (c < 4000000)
{
    sum += c;
    t1 = t2 + c;
    t2 = c + t1;
    c = t1 + t2;
}
sw.Stop();
Console.WriteLine(sum + " - " + sw.Elapsed);
Console.ReadKey();

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private static void CodeKata2()
{
    const long limit = 4000000;
    long result = FibSeq()
        .TakeWhile(l => l < limit)
        .Where(l => l%2 == 1)
        .Sum();

    Console.WriteLine(result); // 4613731
}

// infinite Fibonacci sequence
public static IEnumerable<long> FibSeq()
{
    long a = 0;
    long b = 1;
    while (true)
    {
        long next = a + b;
        if (a < b) a = next; else b = next;
        yield return next;
    }
}

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[1..100]
    |> List.map (fun n->
                    match n with
                    | n when n%5 = 0 && n%3 = 0 -> "FizzBuzz"
                    | n when n%3 = 0 -> "Fizz"
                    | n when n%5 = 0 -> "Buzz"
                    | n -> string n
                 )
    |> List.iter (printfn "%s")

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sing System.Linq;

namespace KATA_NASA
{
  using System;

  public class FizzBuzzKata : IFizzBuzzKata
  {
    
    public string Answer(int i)
    {


      Func<int, string, string>[] analysers = new Func<int, string, string>[]
                                                {
                                                  (input, current) => i % 3==0 ? current + "fizz" : current,
                                                  (input, current) => i % 5==0 ? current + "buzz" : current,
                                                  (input, current) => current==String.Empty ? input.ToString() : current
                                                };


      return analysers.Aggregate(String.Empty,
                                 (data, function) => function(i, data));


      //Klasika
      //string result = i.ToString();
      //bool isFizz = false;
      //if (i % 3 == 0)
      //{
      //  result = "fizz";
      //  isFizz = true;
      //}

      //if (i % 5 == 0)
      //{
      //  result = isFizz ? result + "buzz" : "buzz";
      //}

      //return result;
    }
  }

  public interface IFizzBuzzKata
  {
    /// <summary>
    /// Give an answer to the current game
    /// </summary>
    /// <param name="number">current number in the game sequence</param>
    /// <returns>appropriate answer to the current number</returns>
    string Answer(int number);
  }
}

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IFizzBuzzKata kata = new FizzBuzzKata();
Enumerable.Range(1, 100).Select(kata.Answer).ToList().ForEach(Console.WriteLine);

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private void FizzBuzz()
{
    for (int i = 1; i <= 100; i++)
    {
        string s = string.Empty;
        if (i % 3 == 0) s += "Fizz";
        if (i % 5 == 0) s += "Buzz";
        if (s != string.Empty) Console.WriteLine(s);
        else Console.WriteLine(i.ToString());
    }
}