Happy Number

In this post, we will learn how to check a happy number. A number is called a happy number if it will yield 1 when it replaced by the sum of the squares of its digits repeatedly.

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Implementation Using Java:

import java.util.Scanner;
public class HappyNumber {
	public static void checkHappy(int n)
	{
		while(n!=1)
		{
			int sum=0;
			while(n!=0)
			{
				int temp=n%10;
				sum=sum+(temp*temp);
				n=n/10;
			}
			n=sum;
		}
		if(n==1)
		{
			System.out.println("It is happy number");
		}
		else
		{
			System.out.println("It is not happy number");
		}
	}
	public static void main(String[] args) {
		Scanner sc=new Scanner(System.in);
		System.out.println("Enter the number:");
		int n=sc.nextInt();
		checkHappy(n);
		}
}

Output: 
Enter the number:91
It is Happy number

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Happy Coding!

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