Happy Number – Replace the number by the sum of the squares of its digits, and repeat the process. At the end, if the number is equals to 1 then it is a Happy Number, or it loops endlessly in a cycle that does not include 1 (if it is not a happy number then this process will end at 4).
For example:
23 is a Happy Number
23 :> 2^2 + 3^2 = 13
13 :> 1^2 + 3^2 = 10
10 :> 1^2 + 0 = 1
As we reached to 1, 23 is a Happy Number.
42 is a UnHappy Number
42 :> 4^2 + 2^2 = 20
20 :> 2^2 + 0 = 4
As we reached to 4, 42 is a UnHappy Number.
C
#include<stdio.h>
int main()
{
int num,temp,sum=0;
printf("Enter a Number : ");
scanf("%d",&num);
while(sum!=1 && sum!=4)
{
sum=0;
while(num>0)
{
temp=num%10;
sum+=(temp*temp);
num=num/10;
}
num=sum;
}
if(sum==1)
printf("Happy Number");
else
printf("UnHappy Number");
return 0;
}C++
#include<iostream.h>
int main()
{
int num,temp,sum=0;
cout<<"Enter a Number : ";
cin>>num;
while(sum!=1 && sum!=4)
{
sum=0;
while(num>0)
{
temp=num%10;
sum+=(temp*temp);
num=num/10;
}
num=sum;
}
if(sum==1)
cout<<"Happy Number";
else
cout<<"UnHappy Number";
return 0;
}Java
import java.util.Scanner;
class HappyNumber
{
public static void main(String args[])
{
int num;
int temp;
int sum = 0;
Scanner sc= new Scanner(System.in);
System.out.print("Enter a number : ");
num = sc.nextInt();
while (sum != 1 && sum != 4)
{
sum = 0;
while (num > 0)
{
temp = num % 10;
sum += (temp * temp);
num = num / 10;
}
num = sum;
}
if (sum == 1)
{
System.out.print("Happy Number");
}
else
{
System.out.print("UnHappy Number");
}
}
}C#
class HappyNumber
{
public static void Main()
{
int num;
int temp;
int sum = 0;
Console.Write("Enter a number : ");
num = Convert.ToInt32(Console.ReadLine());
while (sum != 1 && sum != 4)
{
sum = 0;
while (num > 0)
{
temp = num % 10;
sum += (temp * temp);
num = num / 10;
}
num = sum;
}
if (sum == 1)
{
Console.Write("Happy Number");
}
else
{
Console.Write("UnHappy Number");
}
Console.ReadKey(true);
}
}Python
sum = 0
num = int(input("Enter the number: "))
while (sum != 1 and sum != 4):
sum = 0
while (num > 0):
temp = num % 10
sum += (temp * temp)
num = num // 10
num = sum
if (sum == 1):
print("Happy Number")
else:
print("UnHappy Number")
OUTPUT:
(1st Run)
Enter the number: 19
Happy Number
(2nd Run)
Enter the number: 165
UnHappy Number