Mission "TCS DIGITAL" ( Upgrade Ninja to Digital ) previous year Coding Quistion 02

Problem 2 :

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Q2 :

Sum of the digits of the given positive integer number N is UNO or not.

Problem Statement :

Given a positive integer number N, reduce the number of digits of N by computing the sum of all the digits to get a new number. If this new number exceeds 9, then sum the digits of this new number to get another number and continue this way until a single digit value is obtained as the ‘digit sum’. The task here is to find out whether the result of the digit sum done this way is ‘1’ or not. If the result is 1 return UNO else not.

Input : 254

output : not

Input : 235

output : UNO

Explation :

1. 254 = 2+5+4 = 11

2. 11>9

3. 11 = 1+1 = 2

4. 2<9 but not 1 so

5. output "NOT"

1. 235 = 2+3+5 =10

2. 10>9

3. 10 = 1+0 = 1

4. 1<9 and sum=1 so

5. output "UNO"

Code :

import java.util.Scanner;

public class Problem2 {
    public static void main(String[] args) {
         Scanner sc=new Scanner(System.in);

         int n=sc.nextInt();

         int sum=0;

         while(n!=0 || sum>9){
            if(n==0){
                n=sum;
                sum=0;
            }
            int d=n%10;
            sum+=d;
            n/=10;
         }

         if(sum==1){
            System.out.println("UNO");
         }
         else{
            System.out.println("NOT");
         }
    }
}

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