What is an Armstrong Number?

 

What is an Armstrong Number?

A Number is Armstrong, if the sum of the cubes of the digits of number is equal to the number itself.

Example:

153=(1*1*1) + (5*5*5) + (3*3*3) =153

1, 153, 370, 371, 407 are possible Armstrong numbers under 1000.

Java Code to find Armstrong numbers ranging between 1 to n.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33

import java.util.Scanner; public class Armstrong {     static boolean armstrong(int n)     {         int sum = 0;         int r;         int num = n;         while (n!=0)         {             r = n%10;             sum = sum+(r*r*r);             n = n/10;         }         if(sum == num)             return true;         else             return false;     }     public static void main(String[] args)     {         Scanner obj = new Scanner(System.in);         System.out.println("enter the value for n");         int n = obj.nextInt();         for(int i=1; i<=n; i++)         {             if(armstrong(i))                 System.out.println(i);         }     }     }

Output:

>enter the value for n
500
1
153
370
371
407