public static InstanceClass OperationClass(string Oper)
{
InstanceClass oper = null;
switch (Oper)
{
case "+":
oper = new AddClass();
break;
case "-":
oper = new SubtractClass();
break;
case "*":
oper = new MultiplyClass();
break;
case "/":
oper = new Division();
break;
}
return(oper);
}
static void Main(string[] args)
{
InstanceClass operClass = null;
//Console.WriteLine("请输入num1:");
operClass.Num1 = 1;
//Console.WriteLine("请输入num2:");
operClass.Num2 = 2;
Console.WriteLine("请输入符号：");
string oper = Console.ReadLine();
Operation.OperationClass(oper);
double result = operClass.GetResult();
Console.WriteLine("运算结果是：" + result);
Console.Read();
}