1、usingSystem;usingSystem.Collections.Generic;usingSystem.Linq;usingSystem.Windows.Forms;namespace計算器staticclassProgram/<summary>/應用程序的主入口點。/summarySTAThreadstaticvoidMain()Application.EnableVisualStyles();Application.SetCompatibleTextRenderingDefault(false);Application.Run(newForm1();usingSyste

2、m.ComponentModel;usingSystem.Data;usingSystem.Drawing;usingSystem.Linq;usingSystem.Text;usingSystem.Windows.Forms;namespace計算器publicpartialclassForm1:FormpublicForm1()InitializeComponent();privatevoidbutton1_Click(objectsender,EventArgse)intfirst=0,second=0,result=0;stringsymbol;first=Convert.ToInt1

3、6(textBox1.Text.Trim();second=Convert.ToInt16(textBox3.Text.Trim();symbol=comboBoxl.Text;switch(symbol)(case"+”:result=first+second;break;方法的封裝case"-":result=first-second;break;case"*”:result=first*second;break;case"/”:result=first/second;break;textBox2.Text=result.ToString(

4、);privatevoidbutton3_Click(objectsender,EventArgse)(intfir=0,sec=0,result=0;stringsymbol;fir=Convert.ToInt16(textBox1.Text.Trim();sec=Convert.ToInt16(textBox3.Text.Trim();symbol=comboBox1.Text;工廠.creatopertion(fir,sec,symbol).getresult();/靜態方法不需要(暫時)實例化直接調用textBox2.Text=工廠.creatopertion(fir,sec,symb

5、ol).getresult().ToString();privatevoidbutton2_Click(objectsender,EventArgse)(intfir=0,sec=0,result=0;stringsymbol;fir=Convert.ToInt16(textBox1.Text.Trim();sec=Convert.ToInt16(textBox3.Text.Trim();symbol=comboBox1.Text;圭寸裝cal=new圭寸裝(fir,sec,symbol);result=cal.getresult();textBox2.Text=result.ToString

6、();usingSystem;usingSystem.Collections.Generic;usingSystem.Linq;usingSystem.Text;namespace計算器class多態和繼承publicintfir;publicintsec;publicstringsyb;構造函數名稱和類的名稱public多態和繼承(intfir,intsec,stringsyb)相等this.fir=fir;this.sec=sec;this.syb=syb;publicvirtualintgetresult()/繼承intresult=0;returnresult;usingSystem;

7、usingSystem.Collections.Generic;usingSystem.Linq;usingSystem.Text;namespace計算器class工廠publicstatic多態和繼承creatopertion(intfir,intsec,stringsyb)多態和繼承muti=null;/muti是從父類實列出來的一個對象switch(syb)case"+”:muti=new加(fir,sec,syb);break;case"-":break;case"*”:muti=new乘(fir,sec,syb);break;muti=new

8、除(fir,sec,syb);break;returnmuti;usingSystem;usingSystem.Collections.Generic;usingSystem.Linq;usingSystem.Text;namespace計算器class封裝(privateintfirst;privateintsecond;privatestringsyb;public圭寸裝(intfir,intsec,stringsyb)(this.first=fir;this.second=sec;this.syb=syb;/運算符publicintgetresult()(intresult=0;swit

9、ch(syb)(case"+”:result=first+second;break;方法的封裝case"-":result=first-second;break;case"*”:result=first*second;break;case"/":result=first/second;break;returnresult;usingSystem;usingSystem.Collections.Generic;usingSystem.Linq;usingSystem.Text;namespace計算器(class加:多態和繼承(publ

10、ic加(intfir,intsec,stringsyb):base(fir,sec,syb)/繼承父類的繼承方法(publicoverrideintgetresult()/(intresult=0;result=this.fir+this.sec;returnresult;usingSystem;usingSystem.Collections.Generic;usingSystem.Linq;usingSystem.Text;namespace計算器class減多態和繼承public減(intfir,intsec,stringsyb):base(fir,sec,syb)/繼承父類的繼承方法pu

11、blicoverrideintgetresult()/intresult=0;result=this.fir-this.sec;returnresult;usingSystem;usingSystem.Collections.Generic;usingSystem.Linq;usingSystem.Text;namespace計算器class乘：多態和繼承public乘(intfir,intsec,stringsyb):base(fir,sec,syb)/繼承父類的繼承方法publicoverrideintgetresult()/intresult=0;result=this.fir*this.sec;returnresult;usingSystem;usingSystem.Collections.Generic;usingSystem.Linq;usi