using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace 简单工厂设计模式计算器{    class Program    {        static void Main(string[] args)        {            //虚方法、抽象类、接口            //面向对象计算器 案例            while (true)            {                Console.WriteLine("请输入第一个数字");                double n1 = Convert.ToDouble(Console.ReadLine());                Console.WriteLine("请输入第二个数字");                double n2 = Convert.ToDouble(Console.ReadLine());                Console.WriteLine("请输入运算符");                string opera = Console.ReadLine();                CalFather cal = GetCal(opera, n1, n2);//通过opera操作符参数判断生成不同的子类赋值给父类 并返回                double res = cal.GetResult();//调用的父类抽象方法其实是被子类的override重写后的方法                Console.WriteLine(res);                Console.ReadKey();            }                   }        public static CalFather GetCal(string opear, double n1, double n2)        {            CalFather cal = null;            switch (opear)            {                case "+": cal = new Add(n1, n2);                    break;                case "-": cal = new Sub(n1, n2);                    break;                case "*": cal = new Cheng(n1, n2);                    break;                case "/": cal = new Chu(n1, n2);                    break;            }            return cal;        }    }    public abstract class CalFather    {        public double NumberOne        {            get;            set;        }        public double NumberTwo        {            get;            set;        }        public CalFather(double n1, double n2)        {            this.NumberOne = n1;            this.NumberTwo = n2;        }        public abstract double GetResult();    }    public class Add : CalFather    {        public Add(double n1, double n2)            : base(n1, n2)        {        }        public override double GetResult()        {            return this.NumberOne + this.NumberTwo;        }    }    public class Sub : CalFather    {        public Sub(double n1, double n2)            : base(n1, n2)        {        }        public override double GetResult()        {            return this.NumberOne - this.NumberTwo;        }    }    public class Cheng : CalFather    {        public Cheng(double n1, double n2)            : base(n1, n2)        {        }        public override double GetResult()        {            return this.NumberOne * this.NumberTwo;        }    }    public class Chu : CalFather    {        public Chu(double n1, double n2)            : base(n1, n2)        {        }        public override double GetResult()        {            return this.NumberOne / this.NumberTwo;        }    }}