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超级简单版多态计算器

2024-07-15 06:51:11   220人阅读

个人笔记学习黑马四期

一、编写一个操作父类

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace 多态计算器{    /// <summary>    /// 计算父类    /// </summary>    class Operation    {        public int NumA { get; set; }        public int NumB { get; set; }        public Operation(int numA, int numB)        {            this.NumA = numA;            this.NumB = numB;        }        public virtual int GetRes()        {            return 0;        }    }}

二、写出加减乘除的类，继承于操作类

加

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace 多态计算器{    class Add:Operation    {        public Add(int numA, int numB)            : base(numA, numB)        {                 }        public override int GetRes()        {            return base.NumB+NumA;        }    }}

减

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace 多态计算器{    class Jian:Operation    {        public Jian(int numA, int numB)            : base(numA, numB)        {                 }        public override int GetRes()        {            return base.NumA-NumB;        }    }}

乘

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace 多态计算器{    class Ji:Operation    {         public Ji(int numA, int numB)            : base(numA, numB)        {                 }        public override int GetRes()        {            return base.NumA*NumB;        }    }}

除

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace 多态计算器{    class Div:Operation    {        public Div(int numA, int numB)            : base(numA, numB)        {                 }        public override int GetRes()        {            return base.NumA/NumB;        }    }}

三、写Main

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;using 多态计算器;namespace C09多态计算器{    class Program    {        static void Main(string[] args)        {            //多态是基于继承            //找父类            //找子类的共同方法            //找每个子类的同1个方法，具有不同的实现            Console.WriteLine("请输入第一个数字");            int numA = int.Parse(Console.ReadLine());            Console.WriteLine("请输入第二个数字");            int numB = int.Parse(Console.ReadLine());            //            Console.WriteLine("请输入操作符：1.加 2.减 3.乘 4.除");            string opt = Console.ReadLine();            Operation operation=null;             switch (opt)             {                  case "1":                     operation=new Add(numA,numB);                     break;                 case "2":                     operation =new Jian(numA,numB);                     break;                 case "3":                     operation=new Ji(numA,numB);                     break;                 case "4":                     operation =new Div(numA,numB);                     break;                          }            Console.WriteLine(operation.GetRes());            Console.ReadKey();        }    }}

就好了


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