programming-examples/c-sharp/Linq/C# Sharp to display the number and frequency of number from given array.cs

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

class LinqExercise4
{
    static void Main(string[] args)
    {
        int[] arr1 = new int[] { 5, 9, 1, 2, 3, 7, 5, 6, 7, 3, 7, 6, 8, 5, 4, 9, 6, 2 };
        Console.Write("\nLINQ : Display the number and frequency of number from given array : \n");
        Console.Write("---------------------------------------------------------------------\n");
        Console.Write("The numbers in the array  are : \n");
        Console.Write(" 5, 9, 1, 2, 3, 7, 5, 6, 7, 3, 7, 6, 8, 5, 4, 9, 6, 2\n");
        var n = from x in arr1
                group x by x into y
                select y;
        Console.WriteLine("\nThe number and the Frequency are : \n");
        foreach (var arrNo in n)
            {
                Console.WriteLine("Number "+arrNo.Key + " appears " + arrNo.Count()+" times");
            }
        Console.WriteLine("\n");
    }
}