How to find Armstrong Number

6 January 2019 / Naveen AutomationLabs / 2 Comments

How to find Armstrong Number

Learn:
1. check the given number is Armstrong or not.
2. write different test cases for Armstrong Number

Code:

package Questions;

public class ArmstrongNumber {

 //153

 //1*1*1 = 1

 //5*5*5 = 125

 //3*3*3 = 27

 //1+125+27 = 153

 //407 == 4*4*4 + 0 + 7*7*7 = 407

//0

 //1 == 1*1*1 = 1

 //370, 371

 public static void isArmstrongNumber(int num){

  //153 ==  1*1*1    5*5*5      3*3*3

  System.out.println(“given number is “+ num );

  int cube = 0;

  int r;

  int t;

  t=num;

  while(num>0){

   r = num%10; 

   num = num/10;

   cube = cube+(r*r*r);

}

  if(t==cube){

   System.out.println(“this is an armstrong number”);

  }else{

   System.out.println(“this is not an armstrong number”);

}

}

 public static void main(String[] args) {

  isArmstrongNumber(153);

  isArmstrongNumber(370);

  isArmstrongNumber(0);

  isArmstrongNumber(1);

  isArmstrongNumber(455);

}

}

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