Java Program to Check Armstrong Number

An Armstrong number is a number in which the sum of its digits cube is equal to that number itself.

For Example :

Number = 153

1^3 + 5^3 +3^3 = 153

(1 + 125 + 27 = 153)

In the above example ,153 is a 3-digit number and sum of cubes of its digits is equal to the original number.

Few Armstrong Numbers are : 1, 153, 370, 371, 407, 1634, 8208, 9474, ...

Program

import java.util.*;

public class armstrong_num

{

public static void main(String[] args) {

Scanner sc=new Scanner(System.in);

int n=sc.nextInt();

int r,sum=0;

int p=0;

int a=n;

while(a>0)

{

p++;

a=a/10;

}

a=n;

while(n>0)

{

r=n%10;

sum+=Math.pow(r,p);

n=n/10;

}

if(sum==a)

System.out.println(a+" is an Armstrong number");

else

System.out.println(a+" is not an Armstrong number");

}