Added sieve exercise

Missed test ignores on rna-transcription

Author: bressain

config.json

@@ -31,7 +31,8 @@
     "accumulate",
     "crypto-square",
     "trinary",
-    "rna-transcription"
+    "rna-transcription",
+    "sieve"
   ],
   "deprecated": [
 

rna-transcription/ComplementTest.cs

@@ -9,54 +9,63 @@ public void Rna_complement_of_cytosine_is_guanine()
         Assert.That(Complement.OfDna("C"), Is.EqualTo("G"));
     }
 
+    [Ignore]
     [Test]
     public void Rna_complement_of_guanine_is_cytosine()
     {
         Assert.That(Complement.OfDna("G"), Is.EqualTo("C"));
     }
 
+    [Ignore]
     [Test]
     public void Rna_complement_of_thymine_is_adenine()
     {
         Assert.That(Complement.OfDna("T"), Is.EqualTo("A"));
     }
 
+    [Ignore]
     [Test]
     public void Rna_complement_of_adenine_is_uracil()
     {
         Assert.That(Complement.OfDna("A"), Is.EqualTo("U"));
     }
 
+    [Ignore]
     [Test]
     public void Rna_complement()
     {
         Assert.That(Complement.OfDna("ACGTGGTCTTAA"), Is.EqualTo("UGCACCAGAAUU"));
     }
 
+    [Ignore]
     [Test]
     public void Dna_complement_of_cytosine_is_guanine()
     {
         Assert.That(Complement.OfRna("C"), Is.EqualTo("G"));
     }
 
+    [Ignore]
     [Test]
     public void Dna_complement_of_guanine_is_cytosine()
     {
         Assert.That(Complement.OfRna("G"), Is.EqualTo("C"));
     }
 
+    [Ignore]
     [Test]
     public void Dna_complement_of_uracil_is_adenine()
     {
         Assert.That(Complement.OfRna("U"), Is.EqualTo("A"));
     }
 
+    [Ignore]
     [Test]
     public void Dna_complement_of_adenine_is_thymine()
     {
         Assert.That(Complement.OfRna("A"), Is.EqualTo("T"));
     }
 
+    [Ignore]
     [Test]
     public void Dna_complement()
     {

sieve/Example.cs

@@ -0,0 +1,27 @@
+using System.Collections.Generic;
+using System.Linq;
+
+public class Sieve
+{
+    private readonly int limit;
+    public int[] Primes { get; private set; }
+
+    public Sieve(int limit)
+    {
+        this.limit = limit;
+        InitializePrimes();
+    }
+
+    private void InitializePrimes()
+    {
+        var candidates = new Queue<int>(Enumerable.Range(2, limit - 1));
+        var primes = new List<int>();
+        do
+        {
+            var prime = candidates.Dequeue();
+            primes.Add(prime);
+            candidates = new Queue<int>(candidates.Where(x => x % prime != 0));
+        } while (candidates.Any());
+        Primes = primes.ToArray();
+    }
+}

sieve/SieveTest.cs

@@ -0,0 +1,37 @@
+using NUnit.Framework;
+
+[TestFixture]
+public class SieveTest
+{
+    [Test]
+    public void Finds_first_prime()
+    {
+        Assert.That(new Sieve(2).Primes, Is.EqualTo(new[] { 2 }));
+    }
+
+    [Ignore]
+    [Test]
+    public void Finds_primes_up_to_10()
+    {
+        Assert.That(new Sieve(10).Primes, Is.EqualTo(new[] { 2, 3, 5, 7 }));
+    }
+
+    [Ignore]
+    [Test]
+    public void Finds_primes_up_to_1000()
+    {
+        Assert.That(new Sieve(1000).Primes,
+            Is.EqualTo(new[]
+                {
+                    2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101,
+                    103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199,
+                    211, 223, 227, 229, 233, 239, 241, 251, 257, 263, 269, 271, 277, 281, 283, 293, 307, 311, 313, 317,
+                    331, 337, 347, 349, 353, 359, 367, 373, 379, 383, 389, 397, 401, 409, 419, 421, 431, 433, 439, 443,
+                    449, 457, 461, 463, 467, 479, 487, 491, 499, 503, 509, 521, 523, 541, 547, 557, 563, 569, 571, 577,
+                    587, 593, 599, 601, 607, 613, 617, 619, 631, 641, 643, 647, 653, 659, 661, 673, 677, 683, 691, 701,
+                    709, 719, 727, 733, 739, 743, 751, 757, 761, 769, 773, 787, 797, 809, 811, 821, 823, 827, 829, 839,
+                    853, 857, 859, 863, 877, 881, 883, 887, 907, 911, 919, 929, 937, 941, 947, 953, 967, 971, 977, 983,
+                    991, 997
+                }));
+    }
+}