C++ program to check Happy number

In this chapter of C++ program tutorial out task is: 

• write a c++ program to check whether a number is happy or not using function

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Program to check Happy numbers in c++

Below is the program to check happy numbers in c++ or not using if statement and loop.

/*  Program Name: To check whether a number is happy or not
    Program Author: Sayantan Bose
*/

#include<iostream>
using namespace std;
//For calculating the sum of square of the digits
int check(int n){
 int r = 0, sum = 0;
 while(n > 0){
 r = n%10;
 sum = sum + (r*r);
 n = n/10;
 }
 return sum;
 }
 //For checking if the number is happy or not
 void solve(int n)
 {
     int new_n = n;
 while(new_n != 1 && new_n != 4){
 new_n = check(new_n);
 }
 if(new_n == 1)
cout<<n<<" is a happy number";
 else
    if(new_n==4)
 cout<<n<<" is not a happy number";
 }
 //Main function
 int main()
 {
 int n;
 cout<<"Enter the number";
 cin>>n;
 solve(n);
 return 0;
 }

OUTPUT