. NET Learning notes----2015-07-21 (C # Basic review 06, polymorphism review)

Polymorphic

1. Virtual method

2 Abstract class

Object-oriented Calculator case:

    classProgram {Static voidMain (string[] args) {            //implementing Polymorphism: Virtual methods, abstract classes, interfaces//Simple factory for simple calculator effect             while(true) {Console.WriteLine ("Please enter the first number"); DoubleN1 =convert.todouble (Console.ReadLine ()); Console.WriteLine ("Please enter a second number"); DoubleN2 =convert.todouble (Console.ReadLine ()); Console.WriteLine ("Please enter operator"); stringOpera =Console.ReadLine (); Operafather Opf=Getopera (opera, N1, N2); Doubleres =Opf.                GetResult ();            Console.WriteLine (RES);        } console.readkey (); }         Public StaticOperafather Getopera (stringOpear,DoubleN1,Doublen2) {Operafather Opf=NULL; Switch(opear) { Case "+": Opf =NewAdd (N1,N2);  Break;  Case "-": Opf =NewSub (N1, N2);  Break;  Case "*": Opf =NewCheng (N1, N2);  Break;  Case "/": Opf =NewChu (N1, N2);  Break; }            returnOpf; }    }

     Public Abstract classOperafather { PublicOperafather (DoubleN1,Doublen2) {             This. Numberone =N1;  This. Numbertwo =N2; }         Public DoubleNumberone {Get;Set; }  Public DoubleNumbertwo {Get;Set; }  Public Abstract DoubleGetResult (); }

 class   Add:operafather { 
   
    public  Add (
    double  N1, 
    double  Span style= "color: #000000;"        > N2):  
    base  
     (N1, N2) {  
    public  
    override  
    double  
     GetResult () { 
    return
      this . Numberone + this  
   

 class   Sub:operafather { 
   
    public  Sub (
    double  N1, 
    double  Span style= "color: #000000;"        > N2):  
    base  
     (N1, N2) {  
    public  
    override  
    double  
     GetResult () { 
    return
      this . Numberone-this  
   

 class   Cheng:operafather { Span style= "color: #0000ff;" >public  Cheng (double  Span style= "color: #000000;"        > N2):  base   (N1, N2) {  public  override  double   GetResult () { return
     this . Numberone * this  

    class Chu:operafather    {        public Chu (doubledouble  n2)             base(N1, N2)        {        }        publicoverridedouble  getresult ()        {             return  This  This . numbertwo;        }    }

. NET Learning notes----2015-07-21 (C # Basic review 06, polymorphism review)