private static void InterviewTestCode()
{
var inputs = new List <int> {
19, 2, 12
};
foreach (var input in inputs)
{
Console.WriteLine($"{input} -> {HappyNumber.IsHappyNumber(input)}");
Console.WriteLine($"Recursion -> {input} -> {HappyNumber.IsHappyNumberRecursion(input)}");
}
}
