public static double Calc(Digit a, Digit b)
{
if ((a == null) || (b == null))
{
throw new ArgumentNullException("arrgs cannot be null");
}
else
{
var sum = a.Value + b.Value;
return(sum);
}
}
public static void Main(string[] args)
{
Console.WriteLine("----Task 1----");
Digit a = new Digit();
a.Value = 10;
Digit b = new Digit();
b.Value = 20;
Console.WriteLine(Program.Calc(a, b));
Console.WriteLine("----Task 2----");
StartButton startbutton1 = new StartButton();
Car car1 = new Car(startbutton1);
Console.WriteLine(car1.Start());
Console.ReadLine();
}