Q. C# program to check whether the given number N is Armstrong number or not.

Here you will find an algorithm and program in C# programming language to check whether the given number N is Armstrong number or not. First let us understand what is Armstrong number

Explanation : A Armstrong Number is a number that is equal to sum of cubes of each digits.

For Example : 153. So as we can see that the sum of cubes of each digit (1^3=1, 5^3=125, 3^3=27 => 1+125+27=153) is equal to it's number. So 153 is an Armstrong number.

START
  step 1 : read number
  step 2 : set sum=0 and duplicate=number
  step 3 : reminder=number%10
  step 4 : sum=sum+(reminder*reminder*reminder)
  step 5 : number=number/10
  step 6 : repeat steps 4 to 6 until number > 0
  step 7 : if sum = duplicate
  step 8 : display number is armstrong
  step 9 : else 
  step 10 : display number is not armstrong
STOP

C# Program To Check Armstrong Number

using System;  
public class LFC  
{  
  public static void Main(string[] args)  
  {  
    int  n,r,sum=0,temp;           
    n= 153;     
    temp=n;      
    while(n>0)      
    {      
      r=n%10;      
      sum=sum+(r*r*r);      
      n=n/10;      
    }      
    if(temp==sum)      
      Console.Write("The number "+temp+" is Armstrong Number.");      
    else      
      Console.Write("The number "+temp+" is Not Armstrong Number.");      
  }  
}

Output

The number 153 is an Armstrong number.