October 17, 2021

Programmingempire

This article contains Programs to Find Armstrong Numbers in C#. To begin with, let us first understand what is an Armstrong number?

Armstrong Number

To illustrate, suppose we have a number n. Further, suppose it has total m digits. Now take each digit of the number at a time and compute the value of that digit raised to the power m. After that find sum of all such computed values. Basically, if the resulting sum is equal to the number n, then it is an Armstrong number.

For example,

Let n=1634. Therefore, m=4. After that, we compute the following values.

1⁴ = 1

6⁴ = 1296

3⁴ = 81

4⁴ = 256

Further find the sum = 1 + 1296 + 81 +256 = 1634. Since, the resulting sum is equal to the number n =1634, it is an Armstrong number.

Examples of Armstrong Numbers

The following are some of the examples of Armstrong Numbers.

Following are Some of the Programs to Find Armstrong Numbers in C#

Basically, One-Digit Armstrong numbers are 1, 2, 3, 4, 5, 6, 7, 8, 9. Since each digit raised to power 1 is the same as the digit itself. However, there is no two-digit Armstrong number exists. Similarly, three-dist Armstrong numbers are 153, 370v371, 407. Likewise, four-digit Armstrong numbers are 1634, 8208, and 9474. Besides, five-digit Armstrong numbers are 54748, 92727, 93084.

The following program shows two functions to find Armstrong numbers. While the function FindArmstrong determines whether a randomly generated number is an Armstrong number or not. Another function called as ArmstrongNumbersInRange checks the range of numbers from 10 to 999 and determines whether any number in this range is an Armstrong number. However, you can also change this range to find more Armstrong numbers.

using System;

namespace ArmstrongNumberDemo
{
    class Program
    {
        static void Main(string[] args)
        {
            bool b2;
            Random r = new Random();
            int n= r.Next(10, 999);
            Console.WriteLine("Checking a randomly generated number...");
            b2 = ArmstrongClass.FindArmstrong(n);
            if (b2)
                Console.WriteLine(n + " is an Armstrong Number.");
            else
                Console.WriteLine(n + " is not an Armstrong Number.");
            Console.WriteLine();
            Console.WriteLine("All Armstrong Numbers in the Range [10 - 999]: \n");
            ArmstrongClass.ArmstrongNumbersInRange();
        }
    }
    class ArmstrongClass
    {
        public static bool FindArmstrong(int n)
        {
            int sum = 0;
            int n1 = n;
            int remainder;
            int result = 0;
            while (n != 0)
            {
               String str = n.ToString();
                int strlen = str.Length;
                n1 = n;
                while(n1!=0)
                {
                    remainder = n1 % 10;
                    result += (int)Math.Pow(remainder, strlen);


                sum += remainder;
                n = n / 10;
            }
            if (n1 == result)
                return true;
            else
                return false;
        }
        public static void ArmstrongNumbersInRange()
        {
            int n1, sum = 0; 
            int remainder;
            int result = 0;
            for(int n=10;n<=999;n++)
            {
                n1 = n;
                while(n1!=0)
                {
                    remainder = n1 % 10;
                    result += remainder * remainder * remainder;

                    sum += remainder;
                    n1 = n1 / 10;
                }
                if(n==result)
                {
                    Console.Write(n + " ");
                }
                result = 0;
                sum = 0;
            }
        }
    }
}

Output

Programmingempire

Armstrong Number

Examples of Armstrong Numbers

Following are Some of the Programs to Find Armstrong Numbers in C#

Further Reading

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