static void Main(string[] args)
{
ClassContext myComtext = null;
Console.WriteLine("Please Input the first Number: ");
string strInputNumber1 = Console.ReadLine();
Console.WriteLine("Please Input your Operator( +, -, *, /): ");
string strOperator = Console.ReadLine();
Console.WriteLine("Please Input your second number: ");
string strInputNumber2 = Console.ReadLine();
switch (strOperator)
{
case "+":
myComtext = new ClassContext(new AddAlgorithm());
break;
case "-":
myComtext = new ClassContext(new MinusAlgorithm());
break;
case "*":
myComtext = new ClassContext(new MultiAlgorithm());
break;
case "/":
myComtext = new ClassContext(new DiviAlgorithm());
break;
default:
break;
}
double result = myComtext.GetResult(Convert.ToDouble(strInputNumber1), Convert.ToDouble(strInputNumber2));
Console.WriteLine("{0} {1} {2} = {3}", strInputNumber1, strOperator, strInputNumber2, result);
Console.ReadKey();
}