//client
static void Main(string[] args)
{
// build the following expression ((((2+5)-1)*4)/3)
Number a = new Number(2);
Number b = new Number(5);
Add addition = new Add(a, b);
Number c = new Number(1);
Sub subtraction = new Sub(addition, c);
Number d = new Number(4);
Multi multiplication = new Multi(subtraction, d);
Number e = new Number(3);
Div divide = new Div(multiplication, e);
Console.WriteLine("\nResult of: {0} is: {1}\n", divide.Show(), divide.Calculate());
Console.WriteLine("Result of: {0} is: {1}", multiplication.Show(), multiplication.Calculate());
Console.ReadKey();
}