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package leetcode;

import java.util.HashSet;

public class HappyNumber {

public static void main(String[] args) {

HappyNumber test = new HappyNumber();

System.out.println(test.isHappy(19));

}

public boolean isHappy(int n) {

HashSet<Integer> set = new HashSet<>();

while(!set.contains(n)){

set.add(n);

int sq= 0;

while(n>0){

int digit= n%10;

sq+=digit*digit;

n= n/10;

} System.out.println(sq);

if(sq==1) return true;

n=sq;

}

return false;

}

}