Code implementation of the calculator software (policy mode +asp.net)

Programming of a policy mode code

usingSystem;usingSystem.Collections.Generic;usingSystem.Linq;usingsystem.web;/// <summary>///Summary description of Class1/// </summary>    Public InterfaceCalculator//declaring a computed interface    {        DoubleCal (DoubleADoubleb); }    Public classAdd:calculator//The interface implements the addition operation   {      Public DoubleCal (DoubleADoubleb) {Doubleresult =0; Result= A +b; returnresult; }   }    Public classSub:calculator//The interface implements the subtraction operation {      Public DoubleCal (DoubleADoubleb) {Doubleresult =0; Result= A-b; returnresult; } }    Public classMul:calculator//interface to implement multiplication operations {      Public DoubleCal (DoubleADoubleb) {Doubleresult =0; Result= A *b; returnresult; } }    Public classDiv:calculator//The interface implements the division operation {     Public  DoubleCal (DoubleADoubleb) {Doubleresult =0; Result= A/b; returnresult; } }  Public classEnvironment//define the object that needs to dynamically change the algorithm {     PrivateCalculator Calculate;  PublicEnvironment (Calculator calculate) { This. Calculate =calculate; }      Public DoubleCal (DoubleADoubleB, String m)//returns the result of the operation     {         return  This. Calculate.    Cal (A, b); }    }

The writing of the binary ASP code and the reference policy mode

usingSystem;usingSystem.Collections.Generic;usingSystem.Linq;usingsystem.web;usingSystem.Web.UI;usingSystem.Web.UI.WebControls;usingSystem.IO; Public Partial classyunsuan:system.web.ui.page{protected voidPage_Load (Objectsender, EventArgs e) {    }    protected voidBianji_click (Objectsender, EventArgs e) {Environment Environment=NULL; DoubleA = Convert.todouble (left. Text);//Assigning a value to a related variable            Doubleb =convert.todouble (right.            Text); stringm =Fuhao.            Text; Switch(m) { Case "+": Environment=NewEnvironment (NewADD ());//a reference to a policy pattern                     Break;  Case "-": Environment=NewEnvironment (NewSub ());  Break;  Case "*": Environment=NewEnvironment (NewMul ());  Break;  Case "/": Environment=NewEnvironment (NewDiv ());  Break; default:                     Break; }                stringAnswer =environment. Cal (A, B, M).                               ToString (); if(Textbox4.text = =answer. ToString ()) {Response.Write ("Answer Right");//determine if the user is answering correctly and give relevant hints                                   }                Else{Response.Write ("answer the wrong"); } ListBox1.Items.Add (left. Text+ Fuhao. Text + right. Text + Label1.Text + answer +"\ n");//The formula is saved to the ListBox control and the correct answer is givenLeft. Text =""; Fuhao. Text=""; Right. Text=""; Textbox4.text=""; }   }    

The effect of three-interface operation

Code implementation of the calculator software (policy mode +asp.net)