Yield

using System;
using System.Collections.Generic;
using System.Text;

namespace Yield
{
class Yield
{
public static class NumberList
{
// Create an array of integers.
public static int[] ints = { 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377 };

// Define a property that returns only the even numbers.
public static IEnumerable GetEven()
{
// Use yield to return the even numbers in the list.
foreach (int i in ints)
if (i % 2 == 0)
yield return i;
}

// Define a property that returns only the even numbers.
public static IEnumerable GetOdd()
{
// Use yield to return only the odd numbers.
foreach (int i in ints)
if (i % 2 == 1)
yield return i;
}
}

static void Main(string[] args)
{

// Display the even numbers.
Console.WriteLine("Even numbers");
foreach (int i in NumberList.GetEven())
Console.WriteLine(i);

// Display the odd numbers.
Console.WriteLine("Odd numbers");
foreach (int i in NumberList.GetOdd())
Console.WriteLine(i);
}
}
}