ARMSTRONG NUMBER PROGRAM IN JAVA

 ARMSTRONG NUMBER:

A positive number is called armstrong number if it is equal to the sum of cubes of its digits for example 0, 1, 153, 370, 371, 407 etc.153 = (1*1*1)+(5*5*5)+(3*3*3)  =153 The sum of square of given number is equal to that number then number is armstrong otherwise number is not armstrong.

• LETS UNDERSTAND 153 IS ARMSTRONG NUMBER OR NOT 

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

(1*1*1)=1  

(5*5*5)=125  (

3*3*3)=27  

So:  1+125+27=153 (VALUE IS SAME THEN THE NUMBER IS ARMSTRONG) 

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 

PROGRAM TO CHECK WHETHER THE GIVEN NUMBER IS ARMSTRONG OR NOT:

import java.util.*;

Armstrong{  

  public static void main(String[] args)  {  

    int c=0,a,temp;  

 System.out.println("enter the number to check number is armstrong");

int n=in.nextInt();//or int a=153;

    temp=n;      while(n>0)      {
    a=n%10;  

    n=n/10;  

    c=c+(a*a*a);  

    }  

    if(temp==c)  

    System.out.println("armstrong number");   

    else  

        System.out.println("Not armstrong number");   
   }
}      

output;

enter the number to check number is armstrong 371

armstrong number