Java - Happy Number Program.

 


 Happy Number Program.


import java.util.Scanner;
class  HappyNum
{
    public static void main(String[] args)
    {
        Scanner sc=new Scanner(System.in);
        System.out.println("Enter Number");
        int num=sc.nextInt();
        int rem=0;
        int sqr=0;
        while(num>9)
        {
            int sum=0;
            while(num>0)
            {
                rem=num%10;
                sqr=rem*rem;
                sum=sum+sqr;
                num=num/10;
            }
            num=sum;
        }
        if(num==1)
        {
            System.out.println("Happy Number");
        }
        else
        {
            System.out.println("Not Happy");
        }
    }
}

 

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