Check whether number is Happy Number or Not in C | C++ | Java | Python

Natural Number:- Replace the Number by the sum of the squares of its digits, and repeat the process. In the end, If the Number is equaled to 1 then it is a Happy Number.

Example:-

 Given Number=31

               31⇒3²+1²=10
               10⇒1²+0²=1
               31 is Happy Number.
                 
                Given Number=11
               11⇒1²+1²=2
                2⇒2²=4
               11 is an Unhappy Number.

Problem statement:- Program to Check whether a number is a Happy Number or Not.

Sample Input/Output:-

Sample Input First: 13                        Sample Output First: It is a Happy Number.

Sample Input Second: 50                    Sample Output Second: It is an Unhappy Number.

Explanation:- 

For output 1st: 13⇒1²+3²=10    10⇒1²+0²=1

For output 2nd: 50⇒5²+0²=25    25⇒2²+5²=29    ............

Data requirement:-

   Input Data:- num

   Output Data:- String output

   Additional Data:- sum, rem

Program in C

Here is the source code of the C Program to check whether the number is Happy Number or Not.

Code:

//Happy Number Or Not
#include<stdio.h>
int main()
{
    int num;
    printf("Enter the number:");
    scanf("%d",&num);
    int sum=0,rem;
     while(sum!=1 && sum!=4)
     {
    sum=0;
    while(num!=0)
    {
        rem=num%10;
        sum+=(rem*rem);
        num/=10;
    }
    num=sum;
    }
   if(sum==1)
    printf("It is a Happy Number.");
   else
    printf("It is an Unhappy Number.");
}

Input/Output:

Enter the number:31
It is a Happy Number.

Program in C++

Here is the source code of the C++ Program to check whether the number is Happy Number or Not.

Code:

#include <iostream>
using namespace std;
int main()
{
    int num,i;
    cout<<"Enter the number:";
    cin>>num;

     int sum=0,rem;
     while(sum!=1 && sum!=4)
     {
    sum=0;
    while(num!=0)
    {
        rem=num%10;
        sum+=(rem*rem);
        num/=10;
    }
    num=sum;
    }
   if(sum==1)
    cout<<"It is a Happy Number.";
   else
    cout<<"It is an Unhappy Number.";
}

Input/Output:

Enter the number:11
It is an Unhappy Number.

Program in Java

  

Here is the source code of the Java Program to check whether the number is Happy Number or Not.

Code:

import java.util.Scanner;
public class HappyNumberOrNot {

public static void main(String[] args) {
Scanner cs=new Scanner(System.in);
     int num;
     System.out.println("Enter a number:");
     num=cs.nextInt();
     int sum=0,rem;
     while(sum!=1 && sum!=4)
     {
    sum=0;
    while(num!=0)
    {
        rem=num%10;
        sum+=(rem*rem);
        num/=10;
    }
    num=sum;
    }
   if(sum==1)
      System.out.println("It is a Happy Number.");
    else
         System.out.println("It is an Unhappy Number.");
  cs.close();
}
}

Input/Output:

Enter a number:
13
It is a Happy Number.

Program in Python
  

Here is the source code of the Program to check whether the number is Happy Number or Not.

Code:

num=int(input("Enter a number:"))
sum=0
while sum != 1 and sum != 4:
    sum=0
    while num!=0:
        rem = num % 10
        sum += (rem*rem)
        num //= 10
    num=sum

if sum==1:
    print("It is a Happy Number.")
else:
   print("It is  an Unhappy Number.")

Input/Output:

Enter a number:50
It is an Unhappy Number.

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