static void Main(string[] args)
{
Context context = new Context(new OperationAdd());
Console.WriteLine("10 + 5 = " + context.ExectureStrategy(10, 5));
context = new Context(new OperationSubstract());
Console.WriteLine("10 - 5 = " + context.ExectureStrategy(10, 5));
context = new Context(new OperationMultiply());
Console.WriteLine("10 * 5 = " + context.ExectureStrategy(10, 5));
Console.Read();
}
