import?java.awt.*;
import?java.awt.event.*;
import?javax.swing.*;
public?class?Calculator?extends?WindowAdapter?implements?ActionListener?KeyListener?
{
????double?dResult=0;
????double?dNowInput=0;
????double?dMemory;
????int??n=0;
????int??nOperation=1;
????int??nBitsNum=0;
????char?ch;
????boolean?alreadyHaveDot=false;
????boolean?keyAvailable=true;
????boolean?alreadyClickedEqueal=false;
????boolean?isTempNowInput=false;
????
????Jframe?f;
????Panel?p1p2p3p4p5p6;
????TextField?tf1tf2;
????Button?b1b2b3b4b5b6b7b8b9b0;
????Button?bDivbSqrtbMultibMinusbPercentbPlusbReciprocalbEqualbDotbNegative;
????Button?bBackspacebCEbCbMRbMSbMCbM;
????
????public?void?display（）?
????{
????????f=new?Jframe（“Calculator“）;
????????f.setForeground（Color.BLUE）;
????????f.setSize（290223）;
????????f.setLocation（220220）;
????????f.setBackground（Color.PINK）;
????????f.setResizable（false）;
????????f.setLayout（new?BorderLayout（44））;
????????
????????
????????p1=new?Panel（new?GridLayout（1355））;
????????p2=new?Panel（new?GridLayout（4555））;
????????p3=new?Panel（new?GridLayout（5155））;
????????p4=new?Panel（new?FlowLayout（））;
????????p5=new?Panel（new?FlowLayout（））;
????????p6=new?Panel（new?FlowLayout（））;
????????p4.add（p1）;
????????p4.add（p2）;
????????
????????tf1=new?TextField（35）;
????????tf1.setText（“0.“）;
????????tf1.setEditable（false）;
????????p5.add（tf1）;
????????f.add（p5BorderLayout.NORTH）;
????????f.add（p4BorderLayout.CENTER）;
????????f.add（p3BorderLayout.WEST）;
????????tf1.addKeyListener（this）;
????????
????????
????????b1=new?Button（“1“）;
????????b2=new?Button（“2“）;
????????b3=new?Button（“3“）;
????????b4=new?Button（“4“）;
????????b5=new?Button（“5“）;
????????b6=new?Button（“6“）;
????????b7=new?Button（“7“）;
????????b8=new?Button（“8“）;
????????b9=new?Button（“9“）;
????????b0=new?Button（“0“）;
????????
????????b1.setForeground（Color.BLUE）;
????????b2.setForeground（Color.BLUE）;
????????b3.setForeground（Color.BLUE）;
????????b4.setForeground（Color.BLUE）;
????????b5.setForeground（Color.BLUE）;
????????b6.setForeground（Color.BLUE）;
????????b7.setForeground（Color.BLUE）;
????????b8.setForeground（Color.BLUE）;
????????b9.setForeground（Color.BLUE）;
????????b0.setForeground（Color.BLUE）;
????????
????????/*add（b1）;
????????add（b2）;
????????add（b3）;
????????add（b4）;
????????add（b5）;
????????add（b6）;
????????add（b7）;
????????add（b8）;
????????add（b9）;
????????add（b0）;*/
????????b1.addActionListener（this）;
????????b2.addActionListener（this）;
????????b3.addActionListener（this）;
????????b4.addActionListener（this）;
????????b5.addActionListener（this）;
????????b6.addActionListener（this）;
????????b7.addActionListener（this）;
????????b8.addActionListener（this）;
????????b9.addActionListener（this）;
????????b0.addActionListener（this）;
????????b1.addKeyListener（this）;
????????b2.addKeyListener（this）;
????????b3.addKeyListener（this）;
????????b4.addKeyListener（th