Question

How to group a list of numbers by even and odd in C#

Answer 1

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

class GroupAListOfNumbersByEvenAndOdd_CSharp
{
    static void Main(string[] args)
    {
        List<int> numbers = new List<int>() {34, 25, 300, 91, 2, 7, 6783, 201, 555, 907, 12002};

        IEnumerable<IGrouping<int, int>> query = from number in numbers
                                         group number by number % 2;

        foreach (var group in query) {
            Console.WriteLine(group.Key == 0 ? "\nEven numbers:" : "\nOdd numbers:");
            foreach (int i in group) {
                Console.WriteLine(i);
            }
        }
    }
}


 
/*
run:
       
Even numbers:
34
300
2
12002

Odd numbers:
25
91
7
6783
201
555
907
 
*/

 

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Answer 2

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

class GroupAListOfNumbersByEvenAndOdd_CSharp
{
    static void Main(string[] args)
    {
        List<int> numbers = new List<int>() {34, 25, 300, 91, 2, 7, 6783, 201, 555, 907, 12002};

        IEnumerable<IGrouping<int, int>> query = numbers.GroupBy(number => number % 2);

        foreach (var group in query) {
            Console.WriteLine(group.Key == 0 ? "\nEven numbers:" : "\nOdd numbers:");
            foreach (int i in group) {
                Console.WriteLine(i);
            }
        }
    }
}


 
/*
run:
       
Even numbers:
34
300
2
12002

Odd numbers:
25
91
7
6783
201
555
907
 
*/

 

70+ SQL courses for beginners and professionals