static void Main(string[] args)
{
Console.WriteLine("****************简单工厂模式***********************");
Console.WriteLine("数字A:");
var a = Console.ReadLine();
Console.WriteLine("数字B:");
var b = Console.ReadLine();
Console.WriteLine("加：+，减：-");
var c = Console.ReadLine();
var oper = Factory.GetOperat(c);
oper.NumberA = Convert.ToDouble(a);
oper.NumberB = Convert.ToDouble(b);
var d = oper.GetResult();
Console.WriteLine(d);
Console.ReadKey();
}
