UVA-10591

প্রবলেমটি পড়ুন এবং বুঝুন 


 #include<iostream>

using namespace std;

int happy(long long int a)
{
    long long int sum=0;
    int remain;

    for(; a!=0;)
    {
        remain=a%10;
        sum=sum+remain*remain;
        a/=10;
    }

    if(sum<10)
    {
        if(sum==1)
            return 1;
        else
            return 0;
    }

    happy(sum);

}

int main()
{
   unsigned long long int test,i=0,a;
    cin>>test;
    int t;

    while(test--)
    {
        i++;
        cin>>a;
        t=happy(a);
        if(t==1)
            cout<<"Case #"<<i<<": "<<a<<" is a Happy number."<<endl;
        else
            cout<<"Case #"<<i<<": "<<a<<" is an Unhappy number."<<endl;
    }
    return 0;
}