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Program to check given number is Armstrong Number or Not using C# and VB.NET

By Ashok Nalam on 23 Jul 2013 | Category: C# | Tagged: .NET number VB.NET 
The Program checks whether given number is Armstrong Number or Not using C#.NET and VB.NET.
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Introduction

"Armstrong number" is an n-digit number that is equal to the sum of the nth powers of its individual digits.

Example1: 153 - Total Number of digits = 3

13 + 53 +33 = 1+125+27= 153 - Armstrong Number

Example2: 1634 - Total Number of digits = 4

14 + 64 +34 + 44= 1+1296+81+256= 1634 - Armstrong Number

Example3: 123 => 13 + 23 +33 = 1+8+27= 36 - Not Armstrong number

Some of more Armstrong numbers are 153, 370, 371, 407, 1634, 8208, 9474, 54748, 92727, 93084, 548834, 1741725, 4210818, 9800817, 9926315, 24678050, 24678051, 88593477, 146511208, 472335975, 534494836, 912985153, 4679307774.

Now we will write a program to check whether given number is Armstrong number or Not using C# and VB.NET.

C#.NET Program:

namespace DotNetMirror
{
    class ArmStrongNumber
    {
        public static void Main()
        {
            Console.WriteLine("********** ArmStrong Number Check Example ********");
            Console.WriteLine("Enter Number to Want to check");
            int numberToCheck = int.Parse(Console.ReadLine());
            int lenthOfNumber = numberToCheck.ToString().Length;
            double reminder = 0;
            double sum = 0;
            int tempNo = numberToCheck;
            while (tempNo > 0)
            {
                reminder = tempNo % 10;
                sum = sum + Math.Pow(reminder, lenthOfNumber);
                tempNo = tempNo / 10;
            }
            if (sum == numberToCheck)
            {
                Console.WriteLine("The given Number {0} is a Armstrong Number", numberToCheck);
            }
            else
            {
                Console.WriteLine("The given Number {0} is NOT a Armstrong Number", numberToCheck);
            }
            Console.ReadLine();
        }
    }
}

VB.NET Version:

Namespace DotNetMirror
    Class ArmStrongNumber
        Public Shared Sub Main()
            Console.WriteLine("********** ArmStrong Number Check Example ********")
            Console.WriteLine("Enter Number to Want to check")
            Dim numberToCheck As Integer = Integer.Parse(Console.ReadLine())
            Dim lenthOfNumber As Integer = numberToCheck.ToString().Length
            Dim reminder As Double = 0
            Dim sum As Double = 0
            Dim tempNo As Integer = numberToCheck
            While tempNo > 0
                reminder = tempNo Mod 10
                sum = sum + Math.Pow(reminder, lenthOfNumber)
                tempNo = tempNo \ 10
            End While
            If sum = numberToCheck Then
                Console.WriteLine("The given Number {0} is a Armstrong Number", numberToCheck)
            Else
                Console.WriteLine("The given Number {0} is NOT a Armstrong Number", numberToCheck)
            End If
            Console.ReadLine()
        End Sub
    End Class
End Namespace
Output:

Note: In simpler way people refers Armstrong number as "sum of cubes of individual digits of a number is equal to the number itself". In this case, replace sum = sum + Math.Pow(reminder, lenthOfNumber) with sum = sum + (reminder * reminder * reminder) in the code.
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