static void Main(string[] args)
{
string option = "";
do
{
Console.WriteLine("Welcome to the Factorial Calculation");
Console.WriteLine("Enter an integer that's greater than 0 but less than 10:");
int fact_input = int.Parse(Console.ReadLine());
Class1 fact1 = new Class1();
Console.WriteLine("The factorial of " + fact_input + " is " + fact1.factCalculator(fact_input));
Console.WriteLine("y/n");
option = Console.ReadLine();
} while (option == "y");
}