Programming Example

Armstrong Number in C#

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💻 Practical Program

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In this section you will learn about Armstrong Number in C# programming language with example and code.

Information & Algorithm

Before going to write the C# program to check whether the number is Armstrong or not, let's understand what is Armstrong number.

Armstrong number is a number that is equal to the sum of cubes of its digits. For example 0, 1, 153, 370, 371 and 407 are the Armstrong numbers.

Let's try to understand why 371 is an Armstrong number.


 371 = (3*3*3)+(7*7*7)+(1*1*1)      
where:      
(3*3*3)=27      
(7*7*7)=343      
(1*1*1)=1      
So:      
27+343+1=371

Know More about Armstrong Number from this link.

Program Code

using System;  
  public class ArmstrongExample  
   {  
     public static void Main(string[] args)  
      {  
       int  n,r,sum=0,temp;      
       Console.Write("Enter the Number= ");      
       n= int.Parse(Console.ReadLine());     
       temp=n;      
       while(n>0)      
       {      
        r=n%10;      
        sum=sum+(r*r*r);      
        n=n/10;      
       }      
       if(temp==sum)      
        Console.Write("Armstrong Number.");      
       else      
        Console.Write("Not Armstrong Number.");      
      }  
  }

Output

Output 1:
Enter the Number= 371
Armstrong Number.

Output 2:
Enter the Number= 342   
Not Armstrong Number.

Explanation

None

How to learn from this program

First read the algorithm, then study the program code line by line. After that, compare the code with the output and finally go through the explanation. This approach helps learners understand both the logic and the implementation properly.

Practice suggestion

After understanding this example, try to rewrite the same program without looking at the code. Then change some values or logic and run it again. This helps improve confidence and keeps learners engaged on the page for longer.