# Geeksforgeeks Solution For " Happy Number "

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Problem :- Happy Number

Solution :-

#include <bits/stdc++.h>
using namespace std;
int numSquareSum(int n)
{
int squareSum = 0;
while (n)
{
squareSum += (n % 10) * (n % 10);
n /= 10;
}
return squareSum;
}
bool isHappynumber(int n)
{
int slow, fast;
slow = fast = n;
do
{
slow = numSquareSum(slow);
fast = numSquareSum(numSquareSum(fast));

}
while (slow != fast);
return (slow == 1);
}
int main()
{
int t;
cin>>t;
while(t--)
{
int n;
cin>>n;
if (isHappynumber(n))
cout <<"1\n";
else
cout <<"0\n";
}
return 0;
}

Output:-

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#### post written by: Ghanendra Yadav

Hi, I’m Ghanendra Yadav, SEO Expert, Professional Blogger, Programmer, and UI Developer. Get a Solution of More Than 500+ Programming Problems, and Practice All Programs in C, C++, and Java Languages. Get a Competitive Website Solution also Ie. Hackerrank Solutions and Geeksforgeeks Solutions. If You Are Interested to Learn a C Programming Language and You Don't Have Experience in Any Programming, You Should Start with a C Programming Language, Read: List of Format Specifiers in C.