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| using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace ConsoleApplication1
{
class Program
{
static void Main(string[] args)
{
Calculate cal = factory.CreateOper("-");
cal.A = 10;
cal.B = 20;
Console.WriteLine(cal.GetResult());
cal = factory.CreateOper("+");
cal.A = 10;
cal.B = 20;
Console.WriteLine(cal.GetResult());
}
}
abstract class Calculate
{
double _NumA = 0;
double _B = 0;
public double A
{
get { return _NumA; }
set { _NumA = value; }
}
public double B
{
get { return _B; }
set { _B = value; }
}
public abstract double GetResult();
}
class Add : Calculate
{
public override double GetResult()
{
return A + B;
}
}
class Minus : Calculate
{
public override double GetResult()
{
return A - B;
}
}
class factory
{
public static Calculate
CreateOper(string oper)
{
Calculate op = null;
switch (oper)
{
case "+":
op = new Add();
break;
case "-":
op = new Minus();
break;
}
return op;
}
}
}
|