NumberPrograms/Happy_Number_14.java at main · javaistic/NumberPrograms · GitHub

33 lines (32 loc) · 1.03 KB

import java.util.*;

public class Happy_Number_14

{

//isHappyNumber() will determine whether a number is happy or not

public static int isHappyNumber(int num)

{

int rem = 0, sum = 0;

//Calculates the sum of squares of digits

while(num > 0){

rem = num%10;

sum = sum + (rem*rem);

num = num/10;

}

return sum;

}

public static void main(String[] args)

{

Scanner sc=new Scanner(System.in);

System.out.println("Enter a number");

int num =sc.nextInt();

int result = num;

while(result != 1 && result != 4){

result = isHappyNumber(result);

}

//Happy number always ends with 1

if(result == 1)

System.out.println(num + " is a happy number");

//Unhappy number ends in a cycle of repeating numbers which contains 4

else if(result == 4)

System.out.println(num + " is not a happy number");

}

Expand file tree